DS is only 2, so we've not needed to hide them so far, really. They're currently under my bed just so they're out of the way. Oh, and DH's is in the back of my wardrobe, but it's not very deep and it's quite a big box, so not fantastically well hidden...
Think next year all presents will be being delivered to Grandma's as she has room to store them away from little eyes...