I'm back to flying a desk here at the end of my military career, and I can most sincerely say that almost every day I had flying (outside of the flights on which I experienced heart-stopping terror) were better -- more interesting, more fulfilling -- than the ones I now have (and previously had at the beginning of my career) working at a desk in an office.
The transition from flying fast, pulling G's and shooting stuff to filling out "Request for Request Forms" has to be stark!