So we went back last night just after 7 PM, the posted wait time was 90 minutes, we went in single rider and ended up waiting about 2.5 hours...guess that it how it works out sometimes. I think the worse part is we spent so much time in a long, bland, boring hallway.
We went this AM again for early entry. When we got up to Gringgotts, the posted wait was 45 minutes, I was surprised that my daughter wanted to try single rider again, it worked out a lot better as we were off the ride and back out in DA by 8:15 AM.
No water effect, but the fog covering the screen as it moves away worked fine as best I could tell in the three rides we have done. My daughter loves this ride (she is 9), I am really impressed with what technology must be behind this ride!