Generally speaking, the MK bus will go to BW, then S/D and continue you on to the YC/BC, if at all. I have yet to take the bus from MK and stop at the other resorts before stopping at BW.
The DHS bus from the Polynesian is fine, but it can take quite awhile to come...at least that was my experience while staying there. Of course, I believe you can walk over to the TTC and get on the DHS bus there...it doesn't make any other stops.