I'm from southwestern MI, so it is harder to avoid Atlanta for us. I will agree though that unless you go during the heart of rush hour, it isn't that bad. We went through on the tail end of a Friday morning rush and it wasn't too bad. If you stay in the car pool lane you will be fine. We never went slower than about 50 MPH while the regular lanes were stop and go...That being said, coming back we went a different way just for the heck of it. Mapquest says it shouldn't be more than a few minutes longer for you.
Detroit to Cleveland to Charleston to Charlotte to Jacksonville to Daytona Beach to Orlando