Have you considered coming in from the west? (Approx 45 minutes longer. 7 hours 13 minutes instead of 6 hours and 28 minutes)
It appears you'll be starting around Augusta. This takes you to I-75 in Macon then I-75 south past Ocala to the Florida Turnpike (toll). Take State Road 429 (toll) south to the western entrance of WDW at Western Way (exit 8).
I believe tolls on the Turnpike have been waived... don't know about 429.
I agree with @JohnD. Drive west until you pick up I-75 (yes, it will suck driving through Atlanta), then south to the Turnpike (just south of Ocala, FL), take 429 (exit 267A) to Western Way (exit 8).