So the more I play, the more I realize ... there really is no story in the game.
I've finished up the first 3 worlds and not much has happened, put in about 8 hours. From what I gather, the game is about 15-20 hours long. Is it like this all the way through... or?
Yep. This game is really just an excuse to give you more Disney worlds to go through and experience. The end of the game'll have story stuff, obviously, but the overarching story is pretty bare here.