For an example Pop has 2880 rooms and POR has 2048 rooms, so about 800 less rooms.
I can't speak for how the buildings are situated in the values, I only stayed at Pop one night.
but I have stayed at POR twice. As to wether of not there are long walks, it's subjective. Some think so, but IMO, nothing is a very long walk.
We like the Mansion section best. Our fav building is Magnolia Terrace.
It's a beautiful resort, and i love walking around it, and strolling along the river paths.