My kids love the decor at POP. That said, they do enjoy the slide at POR. The decor is just very understated from a kids' point of view. We also found the food court to be quite good.
I would politely mention the health issues when you put in your request. It might not help, but it can't hurt. Our DD has asthma and can't walk a lot in the heat. (We went in August) We had hoped to be closer to the main building but we went during
free dining and the resort was booked solid. Once we figured out the bus system, it was fine. If she was really tired, I would get off with her at our bus stop which was close to our building and DH would take the mugs and refill them and then come back to our room. The walk was fine for the rest of us. We also tried this in reverse and had DH and the boys go to the food court in the morning and refill the mugs while DD and I got ready and then we would get on at the close bus stop.