You know what feels really great? What feels like a little jolt of energy or adrenaline, each time it happens? Being "done" with something. That feeling of accomplishment you get, each time you've completed something and turned it over is just freaking awesome. It was one of the great things about when I was a consultant: I got frequent, regular jolts of that "done" feeling.
About the only thing that's in the ball park is being "next" - particularly if you've been waiting a long time. I think the reason for that, though, is two parts: you're now "done" with being in queue and you're able to start anticipate the rush of being "done".