Disney resorts have between 630 and 2,880 rooms. That means they are turning over, on average, 90 to 400 rooms daily (never mind the time Pop "lost" my luggage on a day they had over 1,000 rooms to clean!

). You may never have seen the passionate posts from people whose rooms aren't ready by 2:59:59.
This article
https://www.womansday.com/life/trav...-your-hotel-housekeeper-wont-tell-you-111481/ is from a site I trust. It's interesting overall, but the two pertinent bullet points are:
"
2. There's a lot more to preparing for a new guest than making the bed and stocking clean towels.
Have you ever arrived at your hotel early and huffed and puffed because your room wasn't ready? There's a good reason for that: Preparing a hotel room for a new guest can take twice as long as cleaning a room for a guest who is staying over. "For a new arrival you have to go through the full inspection list, which may have around 100 check points," says Lara Weiss, Managing Director of K Hotels. "There are so many things that must be attended to that you wouldn't think of, including making sure the proper TV Guide is there, checking for stains on the amenity cards and ensuring the bed linens are completely wrinkle free.""
and
"
4. We don't want to wake you up by knocking on your door in the morning, but we have to.
On average, housekeepers clean 13 to 15 rooms a day, but it can be as high as 30 at some hotels. And they're expected to clean them all in one eight-hour shift. So, even if you do put your "Do Not Disturb" sign out, sometimes they still have to knock. "If you're due to check out that day, the housekeepers must clean your room first [so it's ready for new guests]," explains Weiss. "They have to find out if you've left yet in order to stay on schedule." Instead of being annoyed at that rap on the door, try to remember that the person on the other side is just doing his or her job. "
But #3 is very interesting as well.