Don't know if you own a 3DS, but personally I never used AR again beyond the 5 minutes after unboxing and I got one pretty soon after launch. Is it used in titles in any meaningful way?
Bravely Default, the Square-Enix RPG, had an intro where a fairy crawled out of my carpet and flitted around. I don't remember any more AR in that game, but it was kind of a neat gimmick that I hadn't seen since unboxing the handheld.