Peter Pan always has one of the longest lines in the park. But why? Aside from it's popularity (which it somewhat is) I don't think it's the biggest problem it faces. Al pointed out one time that they were thinking of adding another row to the boats. I think this is because of how low of a ride capacity it has. It's the shortest Fantasyland dark ride meaning less cars on the track and it only has one row.
Mr. Toad's also has a pretty long line, not as long as Pan's but I think it's because the ride is longer making it have more cars on the track at one time. What do you think?