We were in Magnolia Terrace - the EXACT same room we had last summer (and I didn't even ask for it)! The East Depot was just a short walk behind our building and I thought the transportation was great. It's the last stop, so the good news is, once you're picked up, the next stop is the parks. The bad news is, you're the last off coming back, so we usually get off at the main (South) depot and take the short walk back to the room.
I've see comments on the boards here that the transportation service seems to be slipping, but we sure didn't see it. We rarely had to wait more than 10 minutes for a bus. We always take the boat ride to DD our first night in, but the first boat filled up and we had to wait for the next - total wait time about 30 minutes. It's a nice ride, but the bus will get you there quicker.