Ditto, I finish a session and wish it was time for the next. Most of my time outside of the gym/work/sorting out my next meal is spent reading about the gym/nutrition. Maybe once I've fine-tuned my diet and programme to perfection I'll settle down a bit but once I hit a plateaux or feel like I'm not getting maximum effectiveness from it I'll be right back in there.
Unless I get injured then I'll just top myself!