Just got back from a weeks stay at MGV and the construction which was going on in the building next to us did not affect our stay at all. The walls were pretty thick. As far as the main pools there are actually 2. The one that is right behind the main building and the one that is across the bridge. I think that the one by our building was the only one with a zero entry if that matters. We stayed in building 84 and it was very nice. It was a brand new building with brand new decor. The decor is not like the pictures on the web site at all. We had a 2 bedroom and it was huge. Well compared to a moderate resort it was huge! The walk to the main building was about 5 minutes. Very relaxing, nice walk.
If you have little kids there is a playset inside of the main building that is wonderful! Also, a ball pit for kids under 3. It was a great way to pass the time while waiting for our room to be ready.
We took the timeshare presentation with my mom and dad who are already Marriott owners, and it was low pressure. Our guy was kind of annoying. Once we told him that we weren't going to be buying that day he totally changed gears and started working on my parents. Which was fine because we only did it for the $100 in Disney gift certificates we got. They ended up buying at MGV. We ended up buying a DVC.
If you have any more questions ask away!