Can’t comment for go north east but I can think of a few routes in Hartlepool that must have been boring to do.
The old service 5 which was about less than 10 minutes for the entire journey from one end to the other and 20 for round trip not so bad in the Stagecoach days when it would work on to the 7 or 12 at the headland but when Arriva took it over for the final few years it must have great fun to do hours of going between Hart Station and the Headland with not many passengers must have been great fun and made the X66 Metrocentre to Gateshead look great in comparison
One recent one during the temporary changes for covid Stagecoach did short service 1 between Marina and Seaton Carew which again was less than 15 minutes to do which can’t have been that good to do.
Am guessing the the TR1 service in Middlesbrough is quite boring as well just constantly going between the Bus Station ( or broadcasting house as it seems to be now ) to Middlesbrough College taking a whole 5 minutes if that must be a joy to do.