We actually had no problems with buses for MK and AK, it was just DD.
Later in the week, my DH and two DS's went to DD for DQ, and he said they waited 45 minutes for a bus back to BWI, and a family they were waiting with said that they had similar waits for DD buses. For a deluxe resort, it does seem a bit ridiculous. When we stayed POFQ, buses were everywhere.