We have stayed at POP in the 80's, 60's and 50's.
We have also stayed at POFQ, CSR, AKL and Poly.
We do not find POP to be too much walking. From the 50's and 60's location, it was a 5-7 minute walk to the main building. The 80's were maybe 2 or 3 minutes longer.
Our favorite location was building 5, in the 60's section, facing the lake. It was very quiet, and just steps away from the main pool and a 5 minute walk to the food court.
POFQ is more compact so there is less walking vs. POP.
CSR is MUCH larger so there is a lot more walking vs. POP.