I get exactly the same feeling from time to time. I remember when I was a kid, I used to get the "WOW" factor from basically everything I played and I could keep on going until sunrise the next morning. These days, only some games can catch my attention for a long period of time and I certainly don't stay up until sunrise to play games anymore. I won't quit gaming anytime soon, there is still a hell of a lot of stuff to play out there that might still give me the satisfaction that I crave.