We only drive! We've driven the last 6 years and yes find it very tolerable!
We break the drive into two days, stop in NC or SC then the next morning drive to FL. We love it...There's lots of good food places as you drive down South.
We are able to pack whatever we want & love not having to rely on Disney transportation. I don't think we could ever do the drive in one day anymore, too tiring... But breaking it up makes it very tolerable!