I work at a pretty good-sized movie studio, and I used to attend screenings at some of the fancier theaters in town: the DGA theater, the Steven Ross theater at Warner Bros, the WGA's theater, etc. These are pretty state-of-the-art theaters, since they're generally used for and by industry professionals rather than hoi polloi. But I quit attending screenings at them because, goddammit, I want my popcorn and snacks, and they don't let you bring them into these cloistered screening rooms.
For a year or two I lived in North Hollywood, just behind the Century 8 theater at Coldwater & Victory. This is a 70s-vintage shithole with Vegas carpet, mirrors on the too-thin walls (during the quiet romantic sections of your Merchant/Ivory type movie, you could always hear the explosions from the Bruckheimer movie next door), sticky floors, the works. But they sold Red Vines (not Twizzlers), had both Cherry Coke and Mr Pibb, and weekday matinees before 5:00 PM were only $4. I used to go in there just for the air conditioning during my summer hiatuses, never caring what was playing.
These days, I go to the Arclight. Reserved seating, comfy seating, excellent sound, careful monitoring of projection and sound quality, slightly higher price to keep out the noisier riffraff, and best of all: no stupid commercials or "Coca Cola Young Filmmaker" spots or any of that craptastic advertising before the movie. Just 2 or 3 trailers, then your feature.
And no late seating.
The pinnacle of moviegoing civilization. Some screenings ate 21+ so you can bring your hooch in from the lobby bar, if you're into that sort of thing.