Emeril's, hands down. My wife and I made the reservations six weeks in advance, could only get a 9:30 PM seating, and spent the whole day at Magic Kingdom before heading over to dinner. It was still one of the top three dinners we've ever had. Impeccable service, amazing food. Could not ask for any better.
(P.S. Had a couple of hurricanes at Pat O'Brian's afterwards. Great night!)