I have never heard of a room at Disney where the shampoo/conditioner/soap was not available, and even if it is somehow forgotten, I'm sure a quick call to either mousekeeping or the front desk would remedy that problem.
On our last trip, every day more and more shampoo was left for us. In a green moment, I decided to leave it behind so it could be used by others. As soon as I got home, I regretted the decision. The products were excellent- I buy the cheap stuff at home and I can't remember my hair ever being so soft and manageable!
Here's a couple of photos taken by MsCoz2000 showing the complimentary products: