I prefer driving to flying, myself. The actual flight time is a lot less than driving time, but when you add in driving to the airport, schlepping all your stuff and kids through the checkin line, security, etc., waiting on the runway while they check whatever light is going off in the cockpit, schlepping the carry-ons and the kids to another plane because the light won't go off, schlepping the carry-ons and the kids to baggage claim, waiting for your baggage, schlepping the carry-ons, the kids, and the baggage to the rental car counter, waiting in line there, schlepping, the kids, the carry-ons and the luggage to the rental car, and then driving the - what is it? about 45 minutes to WDW ---- you've used up quite a bit of time and energy. Plus, you have to do it all on THEIR schedule.
To me, it's so much simpler to load the luggage and the kids in the car, start driving, stop a few times along the way whenever you want to, drive straight to WDW, and unpack the car when you get there. Yes, it takes a bit more time, but with a lot less hassle in the long run. I guess it helps that my kids enjoy long car trips. We listen to books on tape in the car (Harry Potter 4 lasted us to Niagara Falls and back, and plus some extra tooling around town.)
The bottom line this trip, though, is money. Flying is absolutely out of the question, especially since we'd have to rent a car. (The main point of the trip is a family reunion farther south in FL.) The decision is whether to drive or not to go at all.