Thought I'd post about my experience using fastpasses cause I know I was looking for this info before my trip. I went Friday 11/14. I was staying off site so had to buy 3 days before. I logged in right at 7 am on Tuesday and 7D and tron were already gone. I was able to do multiLL and got haunted mansion for 3:05 to 4:05, winnie the pooh for 3:45 to 4:45, and jingle cruise for 4:40 to 5:40. I only had the party tickets in my account and no other tickets. I was happy to get jingle cruise cause that line stayed pretty solid all night.
due to an uber mishap we ended up not arriving in the park until 5 pm. we went straight to winnie the pooh and our band still scanned green no problem. We then decided to ask the workers at haunted mansion if we could use that one since it was over an hour late but our bands still scanned green at that one and we were let on without difficulty. We then did jingle cruise only 5 minutes late. So we used all 3 FP between 5 and 6. We were walking very quickly between the 3 rides though.
Our priority was rides, especially Tron cause I had never ridden it. The wait was high all evening so we decided to watch the fireworks from the tomorrowland bridge and left the bridge just before the fireworks ended. We were walking towards tron while the finale was going off and we got there to a posted 15 minute wait which I think actually only took 5 min. Just an FYI you really can't hear the music at all from the bridge (the one closest to the castle that you lets out by teacups). We had a good view of the fireworks themselves and could see some of the projections on the side of the castle.
Overall we were able to ride everything we wanted and still collect cookies but we did a lot of crisscrossing because waits at the main rides did not go down until the very end of the night and those are of course spread out with peter pan, 7D, tron, etc. We did get to collect a lot of cookies to eat, I encountered 1 worker who said it was 1 per person but everyone else happily gave us 2 at a time. The longest line was for the snowman pretzels but it still moved pretty fast and only took 10 minutes.
I have done the xmas party a few times in years past and I felt like this party was more crowded and the waits were higher than in the past. We still got to do what we wanted with smart planning and being willing to walk fast, but we weren't doing the party specific stuff like parades or characters and we were just 2 adults. The walkways were insanely crowded and we purposely stayed out of the hub entirely.