POR is our fav resort, AB favorite section. We've been in bldg 14 and close to everything, and (I for get the #, but its right next to the furthest MB bldg) in the last AB bldg and away from it all, and its all fine with us. DD10 and I are early birds, so when we wake up (and now with our unexpected blessing DD2 joining us) we'll walk the resort, grab an early breakfast for ourselves and just enjoy the scenery before getting some takeout and doing a room service delivery for DH and DD15. We seem to catch the bus at whatever depot is nearest our room, but even if its standing room only, most guests will vacate a seat when they see a mom with little ones.
We always request AB, but not a specific bldg, and we've always been granted our request. My older 2 don't like to sleep together, so we've always requested AB. I think if you request a specific bldg...especially the ones closest to the food court, you might be disappointed if they can't fulfill your request. This resort is so nice overall, distance to the FC is not a big deal for us, and since Old Man Island is central to pretty much every bldg, it doesnt matter where we are.
Enjoy your trip!