The big difference is that Disney World is a whole location unto itself and there really isn't a reasonably priced alternative means to taking the Disney Bus or Skyliner to get from point A to point B because it's just a vast expanse of land. It's a monopoly system where you have to take Disney transport.
With Surfside/Dockside, as I have stated in the other thread it's a 15 min walk from Surfside to the CityWalk bus terminal. The public LYNX 38 bus (in front of the Surfside parking deck and down Idrive) and 37 Bus (from the Four Points Tower) also goes to the CityWalk Bus Terminal and that only costs $4.50 for a day pass and $16 for a week pass.