I played this game on and off for 5 years. I used to be addicted to it hardcore, but after a 6 month stint with no computer, I came back last week and I realized "I either really don't care for this game any more, or Cataclysm sucks." I'm not sure which one it is, but I'm just bored with it (as many of you are). I'm sure I won't completely stop playing, but I ran a random and I was just like "whelp, I'm done." That's never happened before. Sorry Blizzard, enjoy your billions of dollars. :\
I played vanilla to BC.
Got bored about ~2 years ago and decided to give it another shot using the 10-day free trial or whatever. I got bored within 2 play sessions and quit again.
Got bored last November and decided to try it AGAIN. Picked it up, and haven't put it down since. Not sure what it was this time (Cataclysm came out 1 month after I joined).
I think there are certain things in your life that make you value your MMORPG time more or less. 2 years ago I was 24, working 50+ hrs/week, going to the gym 5-7 times per week, dating a lot, going out a lot... having a lot of fun.
When I recently picked it up again, I was in rehab for my rotator cuff, and I had just met my girlfriend. She turned out to be an uber nerd (totally unexpected), and we're about 13 months into our relationship, and she loves that I play WOW.
Since about April I've been raiding 3x/week for 9 hours total (plus some time on the weekend) while managing to work full-time and go to grad school 2x/week. It's like a hobby... no more and no less. Girlfriend still thinks it's cool that I play, because she can do her own thing (usually schoolwork or watching TV).
Anyway, point is, I think we all go through hot and cold streaks... but we're all gamers at heart. I often wonder to myself why sometimes I'm really into certain games, and sometimes I'm so uninterested I can't play them.