I just went to my first one this week - at the ultrastar movie theatres in La Costa. It was FABULOUS! We saw 27 dresses and it was so much fun. I love going to the movies, and haven't been a while. So I am hooked!
It was a bit of a drive for me (I live in PB) but I found one in Clairemont that I can go to. I plan to do it the next movie they show.
The movie is $5.50 and they set aside a theater just for moms. You can park your stroller, they have changing tables set up, you can BF your baby right in the seat, there are babies on blankets on the floor. It's great!