It's up to you really; if you thing that there is something missing in what you do, or if you think that you are doing too much, change it around. You try, you fail, you try again, until you are happy again.
Have you got a goal, a set target? eg, training for a marathon, or a martial arts fight, or a powerlifting competition, or swimming across the ocean, or whatever...if you are going to the gym just for staying healthy, well, it gets a bit stale after a number of years. You still get the high, but not as much...
And as for being addicted, yes, you are addicted, 8 years now. I wish i can become as addicted as you someday

It's one of the best addictions you can have.
And as for the rest of the guys that posted in this thread...You rock guys; Chillen, Wrangell, FF, you are just experiencing this addiction through your own eyes and set environment, you have your own golden standards that you follow and, thank God you are not selfish, you always try to give pieces of your own experiences back to the people of this forum. You don't have to make it personal