And in the case of most Hotels, keep the soap and shampoo stocked. That's it. I definitely draw a line at rummaging through luggage. TSA does that, and they've become the biggest thieves in the entire travel/hotel experience. The article from the above link about Wynn is silent on luggage.
More and more I just want to stop traveling. Since my business involves travel thats gonna be hard but its coming.
In my experience most housekeeping employees in these hotels are either immigrants or very low skilled people. Perhaps you have something different in a bed & breakfast but not in these hotels.
So the person that uses the same towel to clean the toilet, the sink, and the glasses is not going to be going thru your bag. They were probably doing that before but without their employers permission.
I wonder what the legal standard for this is. Its still your property, so is the room technically for the period of the rental.