You know, it's the weirdest thing I'm in a similar boat. I gamed a ton through high school and college and even after college a lot. It's a part of who I am, console, PC, handhelds, all that good stuff.
In the last year or so though I've changed and I can't explain it. Among other things work keeps me really busy and if I have time I'll maybe sit down for an hour, more than that is uncommon. If I play for more than an hour or two I have to stop because I feel like I should be doing something else. It's the weirdest feeling.
If I play with friends I can play longer without feeling that, but anything single player or even online with strangers after an hour, maybe two, I have to stop and do something else.
I can't explain it. I think I'm getting old. I still love to play, it's just different now.