There were only two instances:
Final Fantasy XII: Revenant Wings - I loved that game, but for the life of me, I couldn't finish it. ):
I was really close to the end, and after failing the same mission several times, I gave up. Months later I decided to use
cheats only in order to see the outcome of the story. Yeah, so I finished it, but I hadly feel like I did anything at all.
Osu! Tatakae! Ouendan - The autospin feature. It screws the high scores and life meter, but whatever - what I was looking for was playing the game and having a good time without having to worry about those damn spinners. So no remorse here.
Other than that, really minor stuff that isn't available in a normal manner. Like playing with the Shy Guy in Mario Kart
I guess that's all.