We stayed on the night of 2/19. If not for the walls around the pool area, we wouldn't have known there was construction going on.
Despite the conventional wisdom on this board, we also opted to use the GCH private entrance for EMH on Monday morning. The line looked daunting when we got in it (around 7:55 for an 8:00 entry). They were already letting people in even though it wasn't 8:00 yet. We were in the park by 8:05, and went straight to Toy Story. It was a complete walk on -- we didn't go through the queue at all, just walked up to the CM who handed us our glasses, and got on the ride. In addition to that, we were able to ride Screamin' twice and Soarin' (complete walk on)...all before the park opened. Note we are slow walkers, so it took us a while to walk to TSMM, then back to Soarin'. If we had hurried, we could have accomplished even more.