I do, usually just a couple of bucks per day, more if I ask for something specific.
You couldn't pay me enough to clean up after someone so I really APPRECIATE those that do it.
Giving them 2 bucks to show my appreciation makes me feel good and hopefully makes them feel good as well.
I tip at ALL hotels except when I ask for maid service to skip me and I have done this at WDW as well as other places.
WDW maids are allowed to be tipped. It is considered a non-tip required, but not a tip excluded (concierge, dvc, greeters are not allowed to accept cash tips).
I think it is a personal choice. I know what I am comfortable with and in the end that's all anyone can do.