Double jumping to me is always an important part of a game if you cant do it at first, no matter how wore out it may be, it always makes for faster movement, better dodging and the whole 'going back to the place at the start you couldnt reach and almost forgot about for something pretty cool" thing.
Sexism at its most awesome? Chaaaa
Makes me wish I could put out the money for next gen systems besides the wii -_-
Makes me wish I had bought the parappa games when I had the chance, I always saw them online and on TV but never put thought into it.