This exactly. I literally change up each time I play what I'll be doing. I've put about 80 hours in and just hit level 40. I've NEVER put 80 consistent hours into a game before. I've put hundreds of hours into a game over a long period of time but never 80 consistent hours.
I put 20 hours into the beta a couple months back and wasn't even close to getting bored. And out of my gaming family and friends, I'm known as the guy that gets bored of games rather quickly.
World of Warcraft and Skyrim are the only 2 games I've put over 1,000 hours in. So I guess those are my two top games of all time. If I had to choose out of the two, Skyrim takes the win.