It's as if I wrote this post myself.  My experience exactly.

I'm glad I'm not too into PC gaming. It seems to be the most addictive. I just remembered how much I played Age of Empires as well.

Elite beat Agents, played it everyday since I bought it

The original Donkey Kong. I must have played it a 1,000 hours. I even made my dad a string art (wierd eh?) thanking him for investing the $600 CDN in the Colecovision to play it at home...

here 4 games that I was addicted to like heroin
1.Ultima Online : Age of Shadows (macro almost 24/7) 5-6accounts with different skill class and powerscrolls to the max. 3-4 $800,000 castles

2.Diablo 2 : played for 1-2 years had 1of every character class all 70+lvls

3. Phantasy Star Online :EP 1-2 gamecube ....Played countless hours offline multiplayer mode with friends 5-6 characters 145+ lvls 200hours each character

4. Super Smash Bros. Melee : everyday after school 3-6hours brawl session with friends for who knows >.>

DDR was the closest thing to an addiction I've had. I haven't played much recently though, but during the period, I wore out 1 foam pad and 1 steel pad. I'ev got 1 steel pad left.

battle for wesnoth. i couldnt stop downloading new fan created campaigns. months after breaking the habit i have a quick look at the website and there is an unofficial league. slowly but surely i am becoming addicted again.

Kingdom Hearts II. I played this game for over a year, clocked in thousands of hours, and beat it over 50 times.

lets see
all the smashes
starcraft and warcraft 2 and 3

i was addicted to UT when i first played it, played it non stop for almost a year, i normaly get addicted to the latest Football Manager (previously Championship Manager) game for about 3 months after its release. Im still hooked on GEOW, multiplayer on that game is like my own addiction.