FWIW Bell services at every hotel will lock up valuables (such as a laptop) whenever you want - so if you want to bring it, and you are staying at a value or mod where it won't fit in the safe, just bring it to bell services and say you'd like your bag locked up (they won't ask what's in it).
Also, WDW resorts have safe deposit boxes behind the front desk (I know they do at POR, so would imagine at least at all mods and deluxes? maybe values too??). I used one on 1 trip to lock up some valuables. They give you a key, they have the other (just like at your local bank), and it was free. I went into it almost daily. You have to go to the front desk and ask for assistance (not every front desk person can go into the safe dep. boxes).