While I have read a few cases of things "disappearing", personally I've never had an issue. I leave my electronics out, for the most part, plugged in and charging. And like the previous poster, we use our Magic Bands for most purchases, but carry somecash and cards with us. We use the safe to lock up wallets, travel documents, etc., mainly so we know where to find them again at the end of the trip.
One trip, I accidentally left the security bar across the door frame, so the door wouldn't lock behind me when running for ice, and forgot to move it back when we left. Our door was unlocked for several hours - we could see it was open as we walked towards it, and found a message on our phone. Dreading the worst, I listened to them tell me that Security found the door unlocked, and reported it, and they wanted to know if anything was taken. It wasn't. I immediately went down to the concierge desk to be sure that they knew it was my own dumb mistake, and not housekeeping, since I know they sometimes do that while cleaning. I sure didn't want anyone else getting in trouble from my stupidity.
I don't purposely leave things of value laying around, and we do adjust the window blinds so that you can't see in from the outside. But I don't fret about hiding things, other than just getting some things out of sight.