I personally love the idea of them being around and bumping into them, but to me, from my experience and friends experiences from Paris, it doesn't work, If you're getting shoved out of the way or can't get to them, then there's no experience of interacting with them, it's just chaotic. I'd rather there be a spot where maybe yes you have to plan, but surely having that interaction is better than none at all, or getting hurt in the process of trying to have an interaction?
People are just too rude and selfish these days, I had a woman shove my three year old out of the way for the monorail and she was politely waiting in line with us, never mind wandering characters haha.