We're here now and just wanted to give my 2 cents on things. Disney is doing a great job on almost all the things they can control (face coverings, distancing, crowd levels, pop up parades, princesses and other characters randomly spotted around the parks). A few kinks need to be worked out around QS mobile order pick up areas (lots of bunching) and some ride exit areas.
The areas they can't control likes guests bunching up behind you in lines, especially when those guests are racing to see how many times they can ride a certain ride before park close, are generally ok but all it takes is one person or group not paying attention or not caring and you'll find yourself closer to someone than you'd prefer to be. This is life in general and you have to go into this knowing you will run into these people a few times each day.
The one major fail for us is DS in the evening. The area around the parking garage escalators that dump you into DS are awful. I feel for the one or two security guards stationed there that are constantly surrounded by mobs of people deciding which way to head, waiting for sanitizer stations, and just generally acting like they always have at DS pre covid. For this reason we won't be returning to DS in the evening, we personally did not feel we could maintain distance and as many others have reported, face covering use there is much lower than the parks and resorts. We'll keep our lunch reservations as day time was much less crowded.
As for masks, they're much less of an issue than I thought they'd be. They're uncomfortable but as the days wear on you really do get used to them. The younger kids I see are doing an excellent job keeping them on, I see very few noses poking out, and our 9 yo has not complained about her mask a single time. The key is to get one that fits and doesn't hurt your ears. We're having the best luck with the Athleta brand ones for adults and the basic kids sized cotton ones from Old Navy for DD. We bring extras in a ziplock bag but only once did DD ask for a fresh one. We have a handful of masks each and need to do a load of wash every other day to make sure we always have a clean one (thanks DVC!). Keep that in mind when packing if you won't have access to laundry. You can wash in sink but it's much better to wash and dry to really get them clean and freshened up.
That being said, we have had a generally very positive experience. Wait levels are insanely low, we've been able to experience stand-by queues we've never been through thanks to FP, and no price can be placed on the freedom of randomly picking what ride you want to go on without constantly being nose down in your phone. Guests and CM are friendly, there's a general aura of being in this together and wanting to be respectful to each other. Reminds me a bit of the atmosphere on the smaller
Disney cruise ships. We're all in this bubble together.