Bus stop order: POFQ, South, West, North and East.
Our bus stop had an overhang in case it rained, lots of tall trees.
Went to POR during Easter week, and my room was closest to the North bus stop. I had no problem with park buses except for Magic Kingdom.
Tried to board the MK bus after supper for Spectromagic, and the bus was filled. We eventually resorted to a back up plan which involved taking a bus to Epcot and going to MK via monorail (which is a ride to our 3 year old).
Since you have a car, you could always drive to POFQ (very close to POR) and be on the first stop.
I went during peak times, maybe your visit won't be so crowded.
Bus transport is more effcient than driving to the parks, especially when the parks close.