It’s an unfortunate condition, only suffered by a few places, but most have a severe case.
Unfortunately, Heidelberg is one of them
The symptoms of Bruggeitis are pretty clear, during the day your streets are awash with thousands of tourists clogging up the pavements, stopping en-mass at every notable sight in the town. Of an evening you return to a quiet existence with just a few people walking the streets.
Whilst Bruges has probably the worst case of this ailment, Heidelberg isn’t too far behind, and Wednesday’s would appear to be a particularly bad day with hundreds of tourists off of river cruises wandering around the town centre following their tour guides.
All I can say is they are missing the best bits. Of an evening, when the day trippers have gone places like Heidelberg and Bruges become much more interesting as you can see everything without falling over tourists.