We just returned last night from 6 nights. I had requested building 6, and, upon checkin, was issued building 5. I asked if there was any way at all to get a room in 6 (I asked VERY nicely). I got upgraded to a riverview room for free. First floor room 6137. It was PERFECT! I couldn't have asked for a better location. The room was beautiful. The toilet flushing at night was loud, but there was no noise at all other than that. No kids running around. No noise at all.
Building 4 looked to be about halfway done. Some rooms were all the way up to beds and mattresses while others were gutted. The construction crew was nice enough to leave the windows open and the lights on at night for us to peak.
The pool was very nice, but we only spent about 1 hour total there.
Buses were fantastic. I don't know why, but there was never, at any point in our trip, a wheelchair or ECV. 3 strollers total, and I bet we took 20 busses at least. We only went to Riverside 2 times. We had to wait 20 minutes at Epcot one time, and every other bus was either immediate or within 5 minutes. We only stood once. Of course, we left the parks right before fireworks in order to make this work.
I don't think I will ever stay anywhere else on property. I loved everything about this resort. The boat, the busses, the themeing, the crowds. The food court masks were a little freaky, but I can handle that.