I had to for Metroid prime a few weeks ago. I didn't know what the fuck to do, since i tried to pick it up without playing it for a year. I soon realized why i stopped playing in the first place, and i quit again. What a boring ass game. I also used it on RE:CV, because, like jajig said, i didn't have the time. Searching for stupid fucking shit because i happened to be standing 1 foot to the right of the hidden switch seemed to be too troublesome for a game with such a retarded storyline.
I won't use them if i'm playing a game i'm enjoying, though. I went through The new super mario bros. with all the coins and warp zones without looking at a walkthrough. Took me a while, since i seldom play games anymore.