I did NYE at WDW for the first time last year and had a blast. I'll break down for you what we did (sorry that it's long):
December 30th- we drove up from Miami, checked in at Pop, then headed to DHS. We felt like having a drink at 50s Prime Time so that was a bit of spontaneity haha. We also loved the hazelnut hot chocolate from the Streets of America. When we realized we weren't going to wait in any lines for rides, we headed over to MK. The weather was nice and chilly. It was definitely PACKED. We didn't really expect to ride much (but we did...I will explain). We met up with friends and when the fireworks were about to go off a bunch of CM's were directing us to a backstage area to actually sit down and watch the fireworks. It was very strange, but cool. They had a DJ back there and some stands set up. After the fireworks (amazing btw), we headed to Tomorrowland. I think we got FP's for Buzz, or we waited because there wasn't much of a wait. Then we headed to New Fantasyland and there was a short wait for Little Mermaid so we took advantage. Then, because we never do, we rode the carousel. Then we headed to the front of the castle where they had a DJ and a "countdown" to NYE party going on. So much fun, we didn't want to leave lol.
NYE: Woke up early-ish and headed to AK. It was around 10-11 and we FP'ed EE and rode Dinosaur with no wait. Then headed to KS where we got a FP for half an hour later and got a drink in the meantime. Once we finished, it was on to Epcot. Wow was it packed. There were people all over! I got food from Mexico and met my sister and her husband at China where they managed to find somewhere to eat our lunch. Then we just walked around and didn't do much. Come nightfall, the parties started...as well as the long lines at the bathroom. We spent the majority of the time at the American Adventure and the lines at Liberty Inn were literally 45 min-1 hour long. They finally opened up some bathroom trailers behind the scenes which helped somewhat. Anyway, I loved the music being played in the US, because it was oldies, Latin music, and contemporary. A little bit of everything which I loved. If you don't like that, my sis and her hubby went to Italy where it felt like a real club. I headed back to the US because I wasn't into the music.
We saw the fireworks (which were behind schedule) and it was very nice and crazy how much pyro was used! After midnight we stayed a little bit longer then strolled out leisurely.
I'd definitely recommend it. Just don't go expecting to ride much and just enjoy the atmosphere! TT was at 5 hours that night! So yeah we got lucky to ride what we did during the trip lol
Have fun!
Magic Kingdom is closing right at 12, Hollywood Studios at 2, Epcot at 1, and Animal Kingdom at 7. 
