The two differences I noticed when we went a few years ago were,
1. There are no adverts, just film trailers, tonnes of them.
2. Children (it seems) can watch any film as long as they have an adult with them. I saw a father take 3 boys between 6-10 to see "Shaft" (15-18 rated in the UK).
It can be a nice was to round off the day, or to escape the sun for a while as long as there is something decent on.