Honestly I kind of used to look down on them also, I think NYC was my first one. It was great. Particularly for the urban canyons in Manhattan seeing them from the second story of a topless bus was a great experience.
Here’s my other tip on busses. The NYC subway is a great system but for a tourist it has one disadvantage: you can’t see the city from the windows. Don’t sleep on the regular busses: you can watch the city go by.
