I've only done Disney and Epcot once, but I grew up 15 minutes from Disneyland... Brian TX is right on in his list. I'd ditch the FAK and PSK, since there are RNs at the first aid station, and the EMS in the area has no doubt been there quite often. Moleskin is a great idea. Chapstick, sunblock. It seemed to rain in Ft Lauderdale everyday at 4 exactly. It's warm enough, but muggy, so if you don't want to stay wet, then pack the ponchos. You might want to wrap anything you don't want getting wet.

Good socks. Good shoes. Sunglasses. Maybe some of the FRS radios if you get seperated, of if you want to let the kids roam free. Just don't be one of those annoying families that talks about randomness just to play, with the volume on super HI (pleasepleasepleaseplease). Water and some snacks are a good idea. Camera and extra film, or batteries if digital (consider an extra memory card). That stuff is pretty pricey.

Have fun!