It varies from hotel to hotel. And, quite possibly from maid to maid within a hotel. I find generally they come in and reset the room to "standard" whatever that may be. But, occasionally, I've found places that, if I've thrown the comforter/cover off the bed a couple times will leave it piled in a neat fold pile somewhere, rather than rebuild it, and will leave other re-arrangements as well.

Also, washcloths are often left over the shower curtain -- but I think that is more often because they're the same colour and don't get noticed, rather than being a conscious choice on their part.