We've done HDDR a few times at the last showing (the best showing IMHO, I've been to all of the times). When you go back to the bus depot there'll be 3-4 busses waiting. The bus driver asks you where you're going and they tell you which bus to go to. They try to group resorts that are around each other on one bus. We were on a bus for WL (with only about 6 other people) that was also taking people back to the Poly (and I imagine the GF and Contemp if anyone needed to go there). They wait for awhile to make sure they have everyone that needs to take a bus back to their resort.