I say wear them, if the family actually wants to. BECAUSE you can't get away with it anywhere else but at Disney. Right? Plus, it's cute for pictures. Now, if everyone is not on board, I would say take them back.
I am a guilty overpacker as well. But DH is no help. I set aside THREE dresses, knowing full well I will only wear two (formal night and Palo), and he asks me "you're not taking the white one?"
So now I'm bringing four. *sigh*
I'm going to have to whittle it down a bit. There are only two of us! We don't need that much! But then I try and get all practical like "what if I spill something, what if something gets wet/dirty, what if I get all sweaty" etc.
So when you see the childless couple with 4 suitcases, you will know that is us.