QS/QL Seizures: I have quicksave bound to a mouse button. That is not a joke. I qucksave at least every 30 seconds. I also used a mod for Oblivion that allowed me to set it up so it autosaved every 60 seconds. Oblivion numbers your saves, incrementing it after each save. The number was well over 10000 saves at one point, and that was some time after a reinstall.
I've really, really started to hate quicksaving in games lately, prefering permadeath. If you can save and load at any time, achieving anything becomes a breeze. If you die, just load from 5 seconds ago. No consequences at all. This is kind of related to Gaming Masochism.
One that isn't in the OP but others have mentioned is reloading after you've spent even just one bullet. Back when I played Counter-Strike I would see people doing this all of the time, and it often caught them off guard. I never had this problem. I often ran around with an AK47 with 6 bullets in the clip, just because.
For all of you poor souls suffering from Looting OCD, I have a suggestion that works wonders: play as a character who hates interacting with people. That means no going to towns or bartering with merchants, which means you have no reason for money, which means you have no reason to fill up your inventory with useless junk. You have to scavenge everything from things you find, or from people you kill.
One disorder not in the OP: getting bored and starting new characters. I do this all of the time with Bethesda games, Dwarf Fortress forts, and Mount & Blade. I just get bored with the way I made the character, and start thinking how interesting it would be to start anew, and to do it better this time. I had dozens and dozens of characters in Oblivion. Most of them with less than 8 hours played.
Edit: I just came up with playstyle idea to help with my quicksaving addiction: selective saving. With Fallout3 as an example, I would only choose to save when I sleep. When I wake up, I can never save until the day is over and I sleep somewhere else. Yeah, that sounds like an excellent idea. I just got a huge desire to reinstall Fallout3 for the umpteenth time.
The only problem would be when the game crashes, which was always a problem with Bethesda games, and especially some mods. That's part of the reason why I picked up a quicksave addiction: the games were quite crashtastic. Ehhh... :/