I went Sunday 12/9 and it wasn't that bad. Apparently not a sell-out. The longest wait was 40 minutes at 7DMT. Pan was 30. BTM shut down during the fireworks and I got on the last train. It re-opened after.
One observation, I was in these lines and with past experience thought, no way those wait times are right. They should be double. But they moved fast because there was no Fastpass line.
Stopped to watch the parade on the way out and was able to get a good spot even though it has already started. The only real crowding was leaving after that. Headed for the TTC ferry and got right on. They had three running and moved a ton of guests out quickly. Don't know what the monorail was like but when I rode it in we had to stop for a few minutes to get another train on the express line for the party. The trams were efficient as well. Very little wait. Maybe it's because it wasn't a sell-out, don't know, but I thought moving all these people out was very organized. Would I do it again? Had fun but probably not. Halloween is better IMO.