Having played since launch and only missed one or two daily achievements, I took a break too. Got Hitman: Absolution, Dishonored and new BF3 content to hold me over until I get the itch again.
I'm with you. I explore all regions in their entirety before moving on to the next area. The fact that I get rewarded for this behavior is a sweet bonus.
It's a tough call, but perhaps getting into some elite skills once you hit 30 will keep you going. Of course if you've looked at what those unlocks hold and they don't look too promising to you, a change of course may be in your best interest.