#1 - with 4 in the family, I'm pretty sure it's still cheaper to drive (even with the price of gas, food along the way, etc.)
#2 - for some odd reason, we actually prefer to drive (I know it takes way longer - we're coming from northern NJ), but we still like the stops along the way (In a previous post I think I've mentioned Crackerbarrels and Waffle Houses!) I just consider the day to drive down and the day to drive back as part of our vacation. We check-in to the CBR on August 13, and check-out on August 20. As far as I'm concerned, we're on vacation from August 12 through August 21.
#3 - LOVE to have the car at WDW. Even though we never leave the world the entire time we are there, there's something liberating about having our family car right there for us whenever we want it.
#4 - I really don't like to fly (kinda scared). But my family knows I will do it, and if anyone really felt strongly (especially the DH who does almost ALL of the driving), I would definitely suck it up and hop on the plane.
So far, this is our fifth trip to WDW, and we've driven 4 times. The first time was when the kids were 3 and 4, and we went with other family members and flying just seemed the way to go. The kids are 15 and 16 now, and they really don't have a problem with the drive. (OK - for this trip, our DD is flying down with her Aunt and meeting us there - but that just makes more room in the car for the 3 of us!!!)
I'm with the poster above who thinks she might have a "transportation" phobia - DH definitely has a heavy foot, and I'm a little white-knuckled during the ride. But still, all things considered, we're definitely just a driving kind of family.