My wife and I just went to Orlando two weeks ago. We had a great time at Magic Kingdom, EPCOT, and Hollywood Studios.
EPCOT is a bit slower-going than Magic Kingdom. But if your kids are not into fast rides, that might be the place to go. Hollywood Studios was my favorite part of the trip. Two rides you must go on: Aerosmith's Rock N' Roll at Hollywood and Mission: Space at EPCOT. Be advised, if you get motion sickness, go onto the "Green" version of Mission: Space. I'm not kidding either, the hallway leading outside from the "Orange" version reeks of vomit.