Definitely a need experience. I've been maybe like 3 or 4 times. I liked how people would be playing frisbee and stuff outside, then when it was dusk everyone would start honking they're horns for them to play the movies. Notice how I said "movies'. Most drive-in you got two movies for the price of one.
Whenever I think of drive-ins, I think of the movie The Outsiders. What a classic.