I think jtemperance put his finger on it—I'd like debugging if I didn't have any time pressures. It's a challenging puzzle, but the solving process can be tedious (especially without a good debugger). I will say that I like fixing bugs, it's just the finding them that's a pain. Of course usually it's a trivial fix (a typo or something) which makes it even more annoying that it took two whole days to find.