We really enjoyed the Mansfield Drive-In this summer. It has three screens, which each show two movies per night. The ticket agents are really helpful - if you go in wanting to see two movies on different screens, they can advise you as to the length of the films and whether you will have to miss the beginning of the second film.
The layout is very practical, so you are never too far from the screen, or the bathrooms. We take a picnic because the food it a little expensive, but the ticket prices are good and we can't complain.