I work in support/service roles, and I only need my resume when I'm job-hunting. I've worked at the same place for the last dozen or so years, so you'd think I wouldn't have touched it for ages, but that's not the case. This job is part-time, and I've had a variety of second jobs over that time, mostly so I can afford to keep working there. (If I were to win the lottery, I'd seriously consider having my boss put me on a salary of $1 per year so I can keep working there, but only the hours I want. They can use my current wages to hire someone to fill my current hours. But I digress.)
Most recently, I hauled out my resume as a part of a application package for a year-long volunteer stint. Which reminds me that I should update my resume to include that work experience - it expands my skill set somewhat, and might come in handy at some point - before I forget the details.