thanks to imagineeringdisney.com, I have been able to find some pretty incredible (and pretty old) pictures of the yesteryears of Disney World. Compare Mickey's button up pants and skinny human arms and tiny feet (it's almost silly!) to this recent picture of his costume, taken from http://www.theorlandovacationstore.com/disney/ Here you can see how lively his face is, how much bigger his hands and feet are, and his carefully designed costume- made just for this parade!
Parade Mickey- like the one in the photo above isn't even the best that the Magic Kingdom has to offer. They also have a Mickey Costume where the eyes open and close, and his mouth moves to match his voice! That Mickey is in a specific meet and greet location in the Circus area of new Fantasyland. There is a wait time for them, just as there are for all characters these days, but if you have young children, it's worth it to see them react to the first time for a Mickey that actually talks back! The other masked characters have perfected the art of nodding and waving, but this is so much cooler! check it out: