The order depends on the park that the bus is coming to/from. I wish I could remember the order off the top on my head, but memory fails.
There are routes where the Main (South Depot) is LAST, which can be a downer in the morning and confusing to those not in the know.
With the last trip we were in Oak Manor (bldg 90) and right next to the East Depot, which is next to bldg 85.
The trip before that we were in the Mansion closest to Alligator Bayou (Magnolia Terrace) and there was the North Depot right next to that.
The Wife and I prefer the location of buildings 80-85-90 to the Bayou buildings. It seems almost that the Bayou buildings are most convenient if you have a car.
My best suggestion would be to search for the Port Orleans Riverside Map on msn or whatever and look at it yourself. Some of the buildings really look like they are a hike from the main complex. That's a big concern for us because we use the main building a lot while we are there.
I would stay away from bldg #95...Parterre Place. It's the closest to FQ and can be a pain in the but..or legs rather..to stay there. I know, we got stuck there a couple of times.
Some of this may not seem like a big deal until you forget something in the room right before you head to the park and have to get that camera, toy, diaper bag or whatever by running both ways. I've done that. Not fun.
-Dave