On one hand, I think I'd rather be working on game code. When looking at the game as it is now, I can't look at any part of it and say "Hey, I made that". I feel a little detached from the game as a result. It's not my game, it's just a game that happens to be made by the company I work for.
On the other hand, it's basically my job to make everyone else's life easier. It feels great when an artist or designer looks at a new editor feature I implemented and talks about how much they like it and how much it's going to help them in their job. In a way, it's a much better feeling than just seeing that my AI works, or that my renderer can actually draw something to the screen.
All in all, its definitely a good experience, and I enjoy it quite a bit.
