I remember one night we managed one last ride on BTMRR. We were still in the queue at closing. By the time we got out, and I had snapped a few photos if BTM and Splash M, the place was pretty deserted. We slowly went down through Adventureland, and there wasn't another guest in site. When I glanced behind us, there were 3 or 4 CMs walking abreast, about 20 feet behind us. They didn't say anything, or approach us to hurry us along, but it was obvious they weren't going to let any guests past them.
Something similar happened at Epcot. We had late dinner reservations at Rose & Crown. Our desserts weren't served until after Illuminations. Our server told us not to rush, so we lingered a little while over our after dinner drinks. The crowds were pretty much gone from WS by the time we left, a little after 10:00.
Again we saw CMs out, standing on the bridge to France - you could exit through IG, but couldn't go further into WS.