Thanks to everyone for your thoughtful responses.
I asked because we were at WDW in January (wish we were there right now!) and stayed at ASMu and AKL. The noise level at ASMu was quite high (I'm being very kind to word it this way) and there wasn't even a Pop Warner Football cheerleading squad staying there! I couldn't believe the room-to-room sound levels--something I had not been prepared for. We heard crying babies as well as a couple who were certainly practicing for their honeymoon if they were not exactly honeymooning itself.
We were on the 2nd floor of Country Fair--a combination of factors I would strongly disrecommend to anyone. Being on the 2nd floor has one surrounded by rooms on all sides and, as most of you know, Country Fair is nowhere near the lobby/food court/bus stop. Also, my dh and I don't wake up until at least 9 am on vacation (I know! not the recommended WDW way, but we like it), so the huge volume of noise from the walkways in the a.m. was not appreciated by us.
At AKL we were initially assigned a room on the 3rd floor near the lobby, but after 3 minutes in it, I realized it was going to be too noisy too and after 5 nights of fitful sleep, I couldn't deal. So a fantastic CM at the front desk moved us to a truly quiet room (4515, in case you're wondering!) (with a great view, btw) and I was in blissful, quiet, animal-viewing heaven.
I agree that one's neighbors have a lot to do with the surrounding noises, as well as the location of the room itself. I've been an apartment dweller for over 30 years and I'm quite used to a certain amount of sound coming from one's neighbors, however, I was totally unprepared for the din at ASMu.
Particular thanks to the poster who mentioned FTW. We've been thinking about doing a cabin there next time if the price is right, although if it's the same price as AKL, we'll probably stay there.
Thanks again -- miffy--