Coming from upstate NY, we (myself, DW, DS(13), DD(11), DD(20)) drive every time we go to WDW. In addition to using the savings on an extra day or two of "Disney Time," the drive helps to build up the anticipation. We load the Ipod with Disney music, put Disney movies into the portable DVD players, play Disney trivia games...Lately, the drive has been just as much fun as the rest of the vacation.
Driving also allows us to time our arrival to as close to park opening as possible, so we don't lose a minute in our favorite place in the world. The one time we flew, we didn't arrive in Orlando until 4:00. After the Magical Express ride and check-in, we didn't get into our first park until 6:30. It seemed like such a waste of a day. By driving, we can time it so that we arrive in WDW by 9:00 am, and we're in the park by 10:00. I can leave the luggage in the car and check-in later.