It's not a perfect analogy, but it's a decent one. Can somebody come up with a better analogy, or are analogies off the table when talking about RPGs, because RPGs are just plain special?
Kinda like a director and actors, right?
How not? Couldn't Lord of the Rings have been a fantasy RPG campaign? Couldn't Serenity have been a science-fiction RPG adventure? Hell, if I got to play an adventure something like The Usual Suspects, I'd be thrilled.
The story of an RPG campaign doesn't have to end up like a movie, but it certainly can, and IMO most do. (I'm saying nothing about the quality of the "film," though.)
On the set of a film, many excellent directors not only take input on staging, dialogue, story, and other things from actors, but actively solicit it.