My parents know the movie from their childhood. My parents introduced me to the movie as a boy. I introduced the movie to my two children. So multiple generations are familiar with the characters and the movie.
As for the attraction, it has many things going for it. It's changed very little since it opened so it's nostalgic for those of us who went to the World as kids. While dark, it's not scary and can be ridden by kids of all ages. You're flying! Nothing else to add to that part.
Working against it and contributing to the line length is the slow omnirover-like loading area. "Slow" is being nice.