I hoard items, which means never using them. Good example, Bioshock, which doesn't have a proper inventory. I will find all the loose extra ammo and items in a level and make a pile which I consider my 'base'. At the same time I obsess over having full ammo (all types), full health, and full......the blue stuff (been a while). I make a Master Save (lol) with me all full on my pile of stuff. As I advance I will occasionally move my base closer to my goal, moving every item with telekinesis and creating another Master Save. Obsessing over this usually has me going over the same room corners in Bioshock 3-4 times, just to make sure.
I tried to do this in Deus Ex, but damn that game makes it difficult because a lot of the time you have to pick one path over the other, which led to a lot of elaborate setting up of scenarios that would use one item for two to three purposes. Explosives, doors, and enemies were usually involved. Never could feel like I had picked that game completely clean though.
I think overall I obsess over stuff like this in all games, and end up leaving the game not even half finished because I'm burned out on it.