We just left the resort and check-out is indeed 11am. We have stayed there about 5 times and have NEVER got a room before 4pm. On the flip side, we almost always have a room ready at OKW and have even checked into BLT at 8AM and got our room!!!! BWV is another one who can never seem to have a room ready before 4pm.
When we left GCV a few days ago, we had a knock on the door from mousekeeping at about 10:55am. We told them we were leaving in 2 minutes, which we did, and when we walked away, I saw a team of 4 housekeepers ready to attack various rooms. They had sheets, towels, etc. in a basket outside of all rooms that they needed to service. Strange to see all the mousekeepers, since I hadn't seen one at all until that morning. FYI, seems they want you out and will come knockin!