We always rent a car and drive to all of the parks. However, since I've been producing the "unofficial CSR thread", I figured I ought to try the buses myself. We got on at the last stop at the CSR and from the time we got on the bus to the time we pulled up at the MK, it was exactly ten minutes. Driving I know it takes less than ten minutes to the AK, and about ten minutes to Epcot and the Studios. Personally, I would NOT take a bus to Downtown Disney -- they run very slowly from all resorts. If we didn't drive, I would take a cab.