I have only used walkthroughs on two games: LoZ and OoT.

I used the walkthrough for LoZ, because that game was extremely confusing. How are you supposed to know where to go to fight Ganon? And on OoT, I used it on my first playthrough, because I was about seven or eight years old. On my second time through it (when I was twelve) I didn't use it except for the water temple, because I missed one of the keys, and had to go back and go through all of it again, and used the guide to help me find it. Barely helped, though....