We stayed Poly concierge last year with our autistic son and chose that again this year. Does it make it easier? It was our first Poly stay so I can't really compare, but I don't know if it made it easier -- other than having food nearby and handy. DS LOVES to stay at hotels that offer contintental breakfasts. He just so enjoys getting several things and lining them all up. I think that is honestly one of his favorite things about vacation

Everyone in the lounge was very nice and very accomodating. They will go out of their way to get whatever you need. For ME, concierge is much less stressful. I just like turning over all the problems of making ADR's to them. They are not able to make any requests for exterior seating for DS due to autism, I have to do that at the restaurant check in. The merchandise delivery directly to your room, I guess is a perk, too, when trying to manage your child -- easier to not have a package to haul around. It is also just nice to have some of the extras provided for the adults. BUT, I LOVED having the lagoon view and that DS could watch fireworks from the room and not be afraid (because of the noise). Eventually, he made it outside with earplugs...he was 7 and the first time he ever enjoyed fireworks.
DS just loved the Poly. The volcano pool is one of his strongest memories (I guess being in the concierge building, it was esp. easy to access, if you are looking for reasons to stay concierge). I think the evening music and low lights were very calming for walks, not to mention the hammocks!
I am so exicted for your trip! I'm thrilled to read of your planning. I know how much this means to you.

I forgot to address the balcony or patio ?. You can make the request, but nothing is guaranteed...unless, as with my DS who had numerous doctors advise that we not stay anywhere with a balcony as they had great concern that he would jump. With that knowledge, we were given a ground floor/patio room. It is nice to be able to walk right out on the lawn and to the beach from your room, but we first had a very obstructed view and couldn't switch rooms for a few days. I think that would be more likely on ground floor than balcony. The kids loved having the ducks and other birds (a couple of bunnies, but called something else) come over to the patio, but it got rather "messy", if you know what I mean. It is my understanding that the second floor doesn't have balconies. This year all docs have said that a balcony will be OK (of course, we must supervise, but he isn't going to pull a Houdini and get out there when our back is turned for two seconds anymore) so we are really hoping to have a balcony view this year! I guess that didn't give you too much of an answer, but maybe some things to consider.