I would love to hear others' experiences with being in Disney around 4th of July? How do the crowds compare to Christmas and New Years Eve?

I heard that sometimes MK closes to capacity on the 4th, does anyone recall that happening with Epcot? I am an AP holder, so I only plan to venture to the parks in the evenings--I'd like to see the Epcot fireworks on the 4th.

With having a vacation home in FL since 2017 and being a 2 trips/year visitor for about 10 years previous--funnily enough I've never been in July!!!