I LOVE going out to the movies. I probably go to the theatres 2-4 times a week.
Sometimes it's to go see a movie I've been waiting for for a long time, but to be honest I can enjoy seeing just about anything.
The whole experience in general is what I go for. The surround sound, the previews, the huge screen. And like Beli said, if I'm seeing a movie, horror or comedy, I tend to jump or laugh harder depending on what the crowd reaction is.
If I see a movie I really loved, I make a priority to buy it. I saw Wedding Crashers twice at the theatre, and bought it they day it came out on DVD.
As far as the things you mentioned that annoy you, well, hopefully I'm not in the same theatre with you, cause I'm one of those white guys that yells at people when they talk during the movie. It's annoying as fuck when people talk out loud, so do everyone else a favor next time and DON'T talk out loud.8)
At the same time, I agree with you that it sucks you can't smoke during the movie, but if the movie's good at all, I don't even think about smoking. And I always get very very stoned before I go, enough so I'm high during the entire movie.
But the bathroom situation does suck. Oh well.
And for food, I just sneak some candy and a drink in. Being that it's winter time, it's easy to put a bottle of Mountain Dew in my coat pocket and a pack of Swedish Fish.
Ummmm...Swedish Fish!!!:D