I belong to the DVC and the BW is my "Home Resort". I have to admitt, I've never really had a "problem" with the transportation there.
However, this past summer there was one day where I began to worry just a little. It was an EE morning at the MK and the lines at the bus stop were very long. One bus arrived and barely made a dent in the line. Then another arrived half full. Unfortunately we still couldn't get on. But right behind that bus was a totally empty bus and it made only 1 more stop then directly to MK.
So I'm hoping that this will hold true again this summer.