We stayed in the Tahiti longhouse in Nov, it was a VERY easy walk to the TTC which made going to Epcot and MK very easy. The walk to the Volcano pool and the GCH were a bit further, but not unmanageable.
What I think is far is if you are staying at a longhouse near the luau cove and you want to go to the TTC. That is a long walk for someone who can’t walk well. But in that case, go to the TTC via the GCH monorail (you’ll have to switch monorails there to go to Epcot)
A few years ago we were in Samoa, which we loved b/c of the proximity of both pools. It’s literally right in between both pools. The walk to the GCH was very short. It’s a very central location.
We’ve also stayed at WL and while we were on the 1st floor, we must’ve been in the last room down the world’s longest hallway!! That seemed far to me.
Compared to moderates or values, the Poly grounds are not hard to get around. There are many walking paths (although the buildings could be marked better!) and it’s really easy to get around. ENJOY!!