Unfortunately we live in a world with people who don't have good intentions. This will be the Disney way of making sure people don't just place a do not disturb sign outside of their door for days on end, engaging in activity they shouldn't be on property. Wynn, in Las Vegas for example; if the Do Not Disturb sign has been outside of a hotel room door for 12 consecutive hours, it triggers an investigation into the matter at the hotel itself. So, realistically, this practice isn't all that new. While Disney may, or may not be going into everyones rooms daily. You probably may receive an in room phone call from the property you're on, if the room occupied sign has been outside of the door for a duration of time they see as suspicious; to A, see if you're ok, and B to see if based on how you're talking to them. Rather or not they need to start investigating your behavior further, or if they just need to send Disney security to your door for confirmation that you're ok, and that theres nothing fishy going on in your room that could raise a red flag.