I am not at all concerned. I was just there Sept 11th to the 26th. Yes, the parks were more crowded on weekends. During the week not so much. However, this is the reason why I am not concerned:
1) Walt Disney World is not playing when it comes to mask wearing. Wear it properly or you can leave! Each time I turnaround, Disney is placing more verbiage in their marketing and in the parks that masks are to be worn unless eating or drinking while stationary.
2) There are multiple cast members on the way in to the front gate watching and telling guests to mask up who are trying to sneak a little more time of fresh air before wearing a mask for the next 8 hours or just simply forgot to put it on (it happens).
3) Miles of markers. Well, maybe not a mile, just A LOT of markers signifying 6ft of space between your party and the next while standing in the queue.
4) Plexiglass in the queue lines where the lines wrap to give an extra layer of protection between guests.
5) Hand sanitizer before you get on the ride and spacing between parties on coasters or rides with multiple seats followed by more hand sanitizer when you get off the ride.
6) Actual soap and water stations in the parks and Disney Springs.
7) Scheduled sanitizing of rides every two hours.
I felt very safe at the parks regardless of crowd levels. Unfortunately, there were small instances where people feel special and need not follow the rules. Most of the time, the behavior was corrected by Cast Members. Some still slipped by. Let’s be real; people not wearing masks properly happens EVERYWHERE. People need to police themselves! Disney does a good job at reminding guests to follow the guidelines.
On a separate note: I recently visited an amusement park in my home state of PA. Knoebels in Elysburg, PA. I invite you to Google it. There was no one enforcing mask rules, hand sanitizer was spotty, cleaning of rides was sparse, no reservation system or crowd level control, people walking and eating, social distancing was not enforced. It was do as you please at your own level of comfort.
After being there one day, I was able to appreciate the steps that Walt Disney World had taken for my safety as well as other guests and cast members. Knoebels, not so much. However to be fair, Walt Disney World has the resources to implement changes and enforce them unlike Knoebels. My point is that even though crowd levels at WDW seem high, you better believe they are doing everything in their power to keep it safe!