We always put CC privileges on the (adults) room keys so we don't have to carry around our credit cards. If you lose a KTTW card, it takes your resort only a minute to cancel and reissue it (not that I know from personal experience or anything

), but if you lose a CC, it can take a week or more to get the replacement (nope--that's never happened to me either

).
As to the Cape May debacle, sorry it was such a hassle for you, FDV. But had it been a room charge, I'm sure the hotel concierge would have been able to fix it before it ever went on your CC. Not that that gave the Cape May people the right to be so difficult, but it would have been a much quicker fix.
In 2006, we had 2 TS restaurants accidentally charge the room instead of use DDP credits, and last month had one CS restaurant do it. I always looked at the receipts they gave back to us, and it took less than a minute to fix the problems. Really, if you just get into the habit of checking your receipts, it's no big deal. And checking your DDP receipts is something you should do anyway, whether or not you have CC privileges on the card, because CM's can make mistakes there, too. Whether it's accidentally adding a zero on the end of your 2 Dole whips (there go 20 snack credits), or double charging you for your TS meal (which you don't figure out until the last day, when you go to pay that $200 Le Cellier bill and you have no credits left

), it happens--CM's are only human.
Before you check out, it's always a good idea to get a printout of all your room charges (front desk folks are happy to do this anytime, 3 times a day if you want) and check them. It's so much easier to fix when you're still there than it is after you've left and the one big charge has gone onto your credit card.