I just went to Magic Kingdom today (my first time visiting Disney since January). Overall, I had a good day! I arrived around 11:15 and left at 4:30, and in that time, I hit 10 rides. Longest waits were 20-25 mins for Big Thunder and SDMT. Mask compliance was good, but I was disappointed that a lot of people were walking around eating and drinking when Disney made a big deal about banning that; not once did I see a CM stop this. Outside of those instances, everyone was wearing their masks properly. It was really strange entering the park and hearing little noise; you could talk to someone and not have to raise your voice loudly. Likewise, walking around the hub with lots of space felt great.
I might be heading to Universal tomorrow; I'm curious to see what's changed since the AP preview.