I cannot believe I am just finding this thread! For our last 4 times we are 50/50 flying/driving.
If you are going for a long weekend, flying is best because you get more time at the parks, because no one is tired from driving 10 hours.
I love driving/riding because we usually watch 1-2 Disney movies, play the license plate game, stop at SC welcome center, GA welcome center and who can pass up FREE OJ at the Florida Welcome center.
We don't have a trip planned for this year. YET!!!!
Enjoy your trip...we have been twice in September and the parks are GREAT and less crowded!!