We live on the NY/PA border (about 1200 miles from WDW). We traveled with a dog and TT, so we took it slow. Left here around 2:00 m on Friday 8/28. Hit the DC area around 8 pm and no traffic problems (it's usually a 5 hour trip but we hit construction on I 81 and stopped for dinner). We spent the night at the KOA outside of Fredericksburg. After a good nights rest, we drove through to the KOA in Kingsland GA, right at the FL border (all I 95). We got in early enough for dinner and time to relax. Left around 8:30 am, got to FW around 11 am and got right into our site. We did take I 4; no traffic problems other than a heavy rainstorm.
On the way home, Google maps took us on 417 rather than I 4. I think we spent about $25 in tolls and it took a lot longer to get back to Kingsland where we were spending the night again. It was pouring rain, so we were stuck with what Google maps was telling us because you could barely see the road much less figure out where you were. We spent the next night at the KOA in Enfield NC which was right off I 95. We took the route 17 way around the DC area as it was the Sunday of Labor Day weekend around noon. That was a very pretty drive and hooked us back to I 81. No traffic problems at all the whole way home.
We have driven straight through and it was a nightmare. Taking our time, stopping along the way and relaxing is what helped to make this an enjoyable trip as far as driving goes.