I agree franko, It used to bug me computer and games magazines printing cheats.
I don't cheat at games because I really don't see the point either.
Oftentimes a good "cheat" is the only way to see cute little things stuck in places by bored programmers. There's instances throughout Quake, Romero's head in Doom, there's an automated turret bunker in DN3d that has graffiti on the inside that says "You shouldn't be here!" (which could only be seen if you
were in there); in Shadow Warrior there's a load of "in jokes" on the backs of cars that are outside of the airport lobby/level you can't get to...unless, again, you use noclip mode.
I mean, the list goes on and on.
It's fun to see stuff like that.
Plus, on playthroughs, God-mode is good for quickly getting to your "favorite" parts.