I work for Publix as a parttime cashier on nights and weekends. When I was in High School, I was a bagger. At Publix, unlike Winn-Dixie, baggers (or Front Service Clerks, as their appropriate title) are not allowed to accept tips. They are paid more (not much more) than min. wage so that they are to be considered as complimentary.
On that note, they can be fired for taking tips. Now, no manager will stand outside and see if they do, as they have more to think about. But when customers make a scene offering tips at the register or near the doors, they can get in trouble. Granted, I have never seen or heard of anyone getting fired over it, but it does fray the rope.
I'm not sure how much Disney enforces their no tipping policy, but I do know that part of your rate is for housekeeping especially. I don't know how much, but when I went to the YC for our 3-day weekend, my husband inquired at the desk, and the front desk lady told us that part of our room night price is specifically for housekeeping and no tipping is necessary.
Just my 2cents