Having been previously shot down in flames for discussion on this matter on another platform, I'll not say anything
too controversial.
Prior to taking photographs of buses, I used to go out on a lot of walks around Tyne & Wear with my mum and the dogs. General photography was very much a beloved hobby of mine, and I was especially keen on water. As sad and boring as it may sound; water actually fascinates me, and I used to love taking photographs of river scenes - hopefully with greenery in the background to complement the photograph.
I was very much a 'silent enthusiast' before August 2012. I looked for all the new buses while I was out and about, looked for repaints etc, but never actually took photos of buses. I occasionally commented on photos on Flickr, but used to avoid it in all honesty.
I decided towards the end of 2012, having taken photos of buses for three months, that I wanted a new camera. The camera I had was good enough for the type of photography I was using it for previously, but for dynamic photographs, it was simply no good. I upgraded (so I thought, anyway) to the Nikon Coolpix L810. I look back at the camera now and I debate whether it was actually the L810 being terrible, or whether it was just me using manual modes for the very first time incorrectly (my Sony DSC W180 wasn't that fancy!). Nevertheless, after a bad three-day experience, it was sent back and I had a massive upgrade to the Panasonic DMC-TZ30. For a Point & Shoot (as I've already said on the 'Cameras' thread), I really can't fault it. This, I feel, improved my bus photography massively. After a few months of having the TZ30, I managed to get sand in it, and I subsequently upgraded again to the TZ40 - paid £120 for the TZ30 to be repaired too, grr!
Back on-topic: bus photography. I'm not a fan of bus station photography either. I feel that a better photograph is taken away from a bus station, allowing the photographer's imagination to come into play. In my opinion, bus stations essentially - with a few exceptions - cut down any chance of the photographer being creative. You just don't (at least in the North East) have a bus station with an amazing backdrop. Equally, if a photographer gets him/herself away from the bus station but takes a daft amount of photographs at the same location continuously, I believe that's equally as tedious - no matter if the world's best backdrop is also pictured.
Everyone has their own way of doing things, but bus station photography just isn't my cup of tea. That said, I often feel that my enthusiasm for buses is not all down to the buses - it's down to another hobby of mine too: travelling. I love discovering new places and looking for nice, rural locations to take photographs both with and without buses pictured also. In addition to the points I've raised, I also agree with what you've said, which, until now, I've not actually considered. We've all heard countless stories of bus station management requesting people to leave the station or move elsewhere in the station etc. If you're outside of the bus station and on a public road, nobody can request that you move - you're not upsetting anybody.
I believe that it's all about the right balance. If you're wanting to get a fair few photographs in one day (I often return with over 100 photos - including duplicate photos I've taken to stand a greater chance of having the vehicle's blind come out), then I feel that you should aim to take photographs away from the bus station as well as in if you must. You'll find a fair few station photographs on my photostream and you'll see quite a few depot shots too, but I feel these are balanced out by the amount of photographs I take away from the stations or commonly used photo spots.
Although I have no preference on locations away from bus stations to take the odd photograph at, I do, as a general rule, aim to have good lighting conditions while taking photographs in locations away from bus stations.
Again, as sad as it may be, I have a list of locations that I want to take a photograph at. Originally using Google Maps as a method of finding places on a service's route, I have decided (in many cases) to test out the location and see if it's changed since the Google Maps van was there. Often discover new locations while doing so, and then I have a walk around the area too, in anticipation of finding further spots.
I'm looking forward to my summer break where I can put the 7-day Get Around ticket I won a few months ago to good use - getting nice photographs (providing the sun's nice to us all!) outside of Tyne & Wear etc etc.
My interest in transport photography has prevailed massively since first starting, and though I do often get bored and feel the need to take a break for a few days (or more), it's always good to get back into the sport when the sun's nice to us all and I have the time to get myself out and take some photographs away from the station. I've also noticed that the number of photographs I've taken of trains has increased in number too.
I'm not setting out to offend anyone here - apologies if you have taken offence by any of my comments!