We've made 12 trips to WDW and we have driven every time. The drive has varied between 813 miles to 858 miles one way. The mileage depends on how turned around we get in Mobile, Alabama, if there are wildfires we have to detour around, etc. etc. etc. How long a drive just depends on the weather and traffic. We've made it in 14 hours and once it took over 18 hours.
Our first trip was taken when our son was just 1 and our daughter was just
11. I am a planner and packer so the drive was no big deal for us. I had enough stuff to keep ANYBODY busy during the drive
We leave between 3:00 to 6:00 p.m. on a Wednesday, drive until we can't stand it anymore (usually between 11:00 or 12:00 midnight) 'cause we have worked all day long. We get up around 7:00 a.m. and hit the road by 8:00 a.m. and make the remainder of the drive.
We thought about flying this year but airfare gets pretty expensive for three people. Our hometown airport isn't very large so, to get decent airfare, we would have to drive over 2 hours and then pay parking for 10 days.
We, honestly, like the drive. We get to spend one-on-one time with each other and the closer we get to WDW, the more excited we get. The drive home isn't so great though since we drive it straight through.