for non-wdw buses they are pretty good.
the buses come every 30 minutes - although as say maybe not the one you want.
don't know if they still do this - but MK and AK shared - Epcot and Studios shared - great for Epcot and Studios
but the MK and AK are as far apart as you can get. So if you leave the MK before the AK closes - it will be a long,long ride.