I am sitting in Beach Club at the moment.... Random thoughts. The parks "feel" less crowded than usual. Esp Magic Kingdom in front of the castle, but with so many things closed in the parks the lines are an issue if you utilize fastpass like my family does. I would have an umbrella because the lines that are "only" 30 minutes(and every line is 30-50 minutes-which to my family gets very old) have so much of the queue outside- in the sun or rain. And when it does start to poor rain it is more difficult to find a place to be dry. The umbrella is better than a poncho for lines because of the sun factor. We come in May every year and the weather is fairly nice this time, but the sun beating on you at 2:00 PM is a factor.
Also, if you are in a park like Epcot and cannot find dining on the app go up to the restaurant itself. The App is either not efficient or it is made to be inefficient. We walked up to Via Niapoli, San Angel Inn, Rose and Crown and every time we were sat within a few minutes at 7:00-8:00 PM with the app showing no availability.
There is still a lot of safety theater going on in the parks. But, if you are looking for social distancing in lines or in the park-that is not happening.
Lastly, not good or bad just an observation. Went to Universal for a day and that is a completely different animal. No mask, everything is open-basically if you did not see someone with an occasional mask it looked and feels like two years ago. Service was pretty suspect because I am sure like Disney they are getting people hired and trained. I am a Disney person, but I enjoyed the experience at Universal as it was "normal". Have fun!!