> Why would people want to work longer? As much as I enjoy technology, working is the least pleasant part of my life.
I think modern industrial civilization encourages a sort of compartmentalization of roles and terms that isn't actually real. Certainly, for many people, their job is not a pleasant part of their life. From that angle, sure, no one wants to keep doing that until the day they die.
But that doesn't mean the alternative—pure idle leisure—is that great either. Doing nothing sounds awesome when you're burnt out, but after a week or two of it, most people will start chewing on the wallpaper.
This dichotomy that "everything that you do for money is unpleasant and unsatisfying" and "everything that is recreational is easy and unchallenging" is false. There is a whole spectrum of difficulty, reward, and monetary compensation and jobs, hobbies, recreations and pastimes occupy all sorts of points on it.
For most people, they want to spend a good portion of their time doing things that are rewarding, and not necessarily easy. Being retired just means you can optimize for personal satisfaction without having to also optimize for monetary gain.
If I could retire today, sure, I'd get a bit more sleep. But I'd also hack more open source code, write more books, and volunteer. Those are difficult things (especially that middle one). Does that make them "work"? In the sense of "working on the book", "my life's work", etc. yes. But is it "work" in the sense of "thing I'd only do for money"? Certainly not.