Oh there is plenty of bus stations abroad, it's just that European Countries don't seemed as obsessed about Health and Safety compared to the UK.

For example at the Bus Station at Chur for Post Auto services, buses / coaches pull forward into a marked bay, then intending passengers walk over the roadway to the bus they want to get on. https://www.flickr.com/photos/gjm-photog...1683408792

Disneyland Paris bus station has a busy bus station, but doesn't have any doors or railings blocking access to the roadway or anything prevent the use of exit doors on vehicles as shown here (and yes that is a high floor bus in 2022) https://www.flickr.com/photos/gjm-photog...2182512499

Leuven Bus Station in Belgium, there is no actual walkways and the bus station is basically a pedestrianized zone so people wander all over the place, enough to give a Nexus Bus Station Supervisor a nervous breakdown. https://www.flickr.com/photos/gjm-photog...2788745521

Even the railways in Europe, especially along the lines that are lower speeds, there is no fencing to stop people going on the tracks. They basically use common sense over there. https://www.flickr.com/photos/gjm-photog...1703111778