Even if Covid wasn't happening, Thanksgiving week was going to be crowded no matter what, so kind of a bright-side?
General thoughts -These crazy low crowds weren't going to stay forever. Once the numbers in Florida got better, you had to know people (locals possibly) were going to start going to the parks again.
This is when people are going need to evaluate what they are comfortable with crowd-wise. If possibly having to be closer to people for short periods of time makes you uncomfortable still, then you need to decide if you want to go or not. Obviously there are a lot of people comfortable with it, thus the increased crowds.
We all keep saying how great Disney is with being cautious - I'm sure they have a capacity limit they are comfortable with. Maybe they are just now starting to reach it. And they aren't going to increase the hours until they start seeing that it will be worth it monetarily.
Now if you are hesitant not because of Covid, but because of long lines, then you may just have to suck it up!