New Years - how bad is it

I fully admit I am not a huge disney world fan. Dont love the prices and the crowds. But my kids faces are priceless. That being said they are older, 14, 12, 11 and went when young. They dont entirely remember. My wife wants to go back. My youngest is very high functioning but autistic and has adhd. I know we can get disability pass. She is suggesting going during school break after christmas through new years.

How bad will it be? With the passes can we get on rides or wait still? And im sure it will be the best fireworks show but will we see it without lining up for a spot for hours?

If it will be fun im all in. If ill be on 2 hr lines no thanks