I just want to +1 this last point; I am a rigid 9-to-5er (actually 7:30-4 for a variety of reasons, but who's counting?), but I care deeply about my craft as a

I just want to +1 this last point; I am a rigid 9-to-5er (actually 7:30-4 for a variety of reasons, but who's counting?), but I care deeply about my craft as a software engineer. I just refuse to work more hours than my employer is willing to pay me. I would rather improve my efficiency at work (something I spend a lot of time doing, e.g. by learning new tech, sharpening my tools) than work more hours. I chose to do this several years ago when I realized I was burning myself out and giving out way too many rainchecks to people I cared about. Point is, I can be both extremely passionate about my work (and do a pretty darn good job of it) and very protective of my time outside of work.