Football Manager is the worst offender for me. I once spent every available moment playing Football Manager for two weeks. Civ is definitely one of the worst, though. It probably was the worst until I started playing FM.
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FF7 through to FF10-2. Also on the old systems, after the first time I beat Sonic, I had to beat it or lose all of my lives/continues from there on out. I was like this while my girlfriend was in the room with me and she was trying to sleep. I was like this when I visited with her and her father up in Canada (Fable II). I was like this recently with a couple of browser games distracting me from my college work (Sword Quest, Marvel Ultimate Alliance... and Wartune). I've been gradually weaning myself off of games entirely. These days I rarely go back to Sword Quest. One weekend a month, I'll play Star Wars Battlefront II with my dad (I still wish for Squix to put out a FFBattlefront, it's the only way I would be able to get my dad to play Final Fantasy; he doesn't understand RPGs). I haven't played a console game on my own for about eight months. I recently beat two DS games (Re:coded and New Super Mario Bros) and haven't had a reason to go back. Right now, my biggest addiction/distraction are forums, online comics, webseries, and deviantart. Also trying to get one of my stories finished.
By the way, this thread would be more appropriately titled "This is how addicting games are"
I think when FF7 came out on Steam I clocked in at about 8 hours per day for the following week.
And I'm still playing it.