WE just went Dec 30 to jan 3. We had a great time! Was it crowded-YES! But we went knowing that we either had to RD, FP+, or stay late to ride what we wanted. WE were OK with skipping things. For example, we spent a morning at AK, we had a great time and never even rode a ride! WE did the trails, looked at the animals, slowed down to really look at the themes. It was a great time! We had park hoppers so we took breaks and went back later to other parks. Now on NYE MK was closed from about 10am to around 3pm (??), but we knew to avoid that day there. We actually saw the NYE firework show on 12/30, as they do it two nights in a row.The decorations are beautiful. I would love to go again for NYE this year! Now if this were a special once in a lifetime trip, or maybe you only go every 5 years, it may not be the best time. The lines are long, like 300 min for test track! Even it's a small world had a 60 min wait! We have been often so we were ok with skipping rides!
Maybe we will see you there!