Can't beat the bus to/from MK.
I am just back Wednesday, I timed the bus, it was between 4 and 6 minutes travel time each time. Also, there is covered seating in the waiting area fro the bus and the walkway to the area is also covered. I never had a problem finding a seat on the bench, but the resort was pretty empty.
the bus back from Epcot stopped numerous times throughout Fort Wilderness. I would use a rental car if going there. Bus to/from MGM was not bad, but longer than 5 minutes.