i can put it this way... to the best of my knowledge (for what that's worth), there's only 2 resorts that never share buses NOR have multiple stops within the resort: Animal Kingdom Lodge and Pop Century. unless you really want to know that the Contemporary, Polynesian and Grand Floridian all share or Caribbean Beach has multiple stops, etc.
When staying at AKL we stopped at BB on the way to Epcot and on the way back from MGM. I don't mind Allstars all sharing buses. Most of the time at Park opening and closing you get your own bus and at least the resorts are right next to each other.