I could have written this too! We have gone in 2019, 2020, (that didn't really count, it was so different), and 2021. We got more rides done in the days before 12/24 than expected, freeing us up the rest of the week to do more holiday things. 1-2 mornings in 2019 (the most packed I've ever seen the parks) my ODD and I knocked out pretty much everything in an hour in the morning EMH at MK that made it much easier to take a breath and enjoy the scenery and vibe.
Depending where you are staying, the
MVMCP fireworks may be viewable from your resort. They're pretty amazing.
With little kids in 2019, we had dinner at Akershus on 12/31 around 5pm. We counted down the New Year in Norway (6pm?) and then made our slow way through all the people to hang out on the boardwalk from around 7-9pm and then took the SKyliner to Riviera. We had a view of MK fireworks and maybe also Epcot, in PJs? Can't remember. Back in 2019 MK used to do NYE on 12/30 and 12/31, so we went on 12/30* to "avoid the crowds." Had an ADR at Skipper Canteen after 6:30 pm fireworks (spectacular) we rode a few rides w FP(ILL). It was incredibly hard to walk around the park, although it was well lit and well directed (think of the crowds leaving after fireworks, but it's everywhere) The rest of the night there was a DJ in the hub and we just danced and hung out and it was probably the most fun I've ever had on "NYE." Great energy, international families face timing their relatives, etc.
*edited: we had already moved to riviera a few days before, the bus to MK was PACKED but super cheerful but crowds were such that we were trying to make the 6:30 fireworks, got on a bus around 5/5:30 and barely made it into the park to see the fireworks around the flagpole at the base of main st. It was still awesome, but just plan to take a lot of extra time to go anywhere. Leaving Epcot around 7pm was like a salmon swimming upstream but then the Boardwalk area was festive and uncrowded. DD1 wanted to ride a surrey bike, DD2 fell asleep in her stroller.
We were staying at VGF-RIV, when we were at VGF we had dinner at/visited all the MK resorts and took pictures with all the decorations.
Also: rope drop Xmas morning is great...
We had ADRs at LaCreperie right around when Remy opened and a late evening ADR was ROUGH. There were several families (including us) sitting on the floor along the entryway and it was similarly about 45m to be seated. We looked for something else but we were like 2nd "in line" (of check in and ADR time). I hope it's gotten better.