YC in November:
Buses to all parks (at all times of the day) always were shared amongst the Epcot resorts. Generally it was at the S&D first, then YC, BC, and finally Boardwalk. Seating was never really an issue as it was the second stop and for whatever reason S&D never really filled the bus.
Heading back from MK, as I remember, it was just YC/BC and the Boardwalk/S&D was a separate bus. That tended to be packed and stopped at BC first, but YC is only a few hundred feet away, no big deal.
WL in September (relating to the concerns about GF):
Ridiculous that it would share with GF, even when heading to AK or HS. Sometimes it was WL and FtW on a line and sometimes it was Poly, GF, WL on a line. Would totally make more sense to have WL with Ft W and then Poly, GF, Cont or some combination thereof. Took far too long to hike over to GF. Oh well...it's still Disney and I rather like sitting on the bus. Although standing on a bus while six months pregnant...not so much fun!
No matter where you choose, I think there will always be transportation drawbacks. Either way, have a fun trip!:wave:
~Amy