About 25 years ago we had £1000 in cash to pay a workman. Just couldn't find it when he came for payment. (It was in the ironing basket.) So embarrassing. We've given up hiding stuff now, as we so often forget on return home! As regards credit/debit cards, when we go to USA to see our family, we simply tell the bank what we're doing, so they can identify suspect activity on the accounts. As for the rest, we leave things as usual. I think it's a good idea to leave a small amount of cash (say £25, in an envelope) in an "obvious" place, like by the phone. If a burglar came, they'd certainly pocket it and they might then leave....
Oh, and last year I came home and found £100 in my knicker drawer - still can't remember when that was put there!