Some fun math related to this.
If you believe:
You get a ballpark estimate of between 15MM and 17MM visitors for the MK for all of 2023.
Split the difference and call it 16MM. That seems like a reasonable first guess.
Of course, posted wait times aren't accurate, and there's a different mix of attractions in 2023 vs previous years.
But I'd argue that that different attraction mix is (generally) already represented in the wait times. The one exception would be TRON, which doesn't post waits. But I think it's a safe assumption to say it's running at 100% capacity with no standby queue.
Incidentally, I also ran this with wait times just during the peak of the day, and got a wider (but similar) range of numbers.