"The paradox of work is that many people hate their jobs, but they are considerably more miserable doing nothing."
I know the feeling. The restaurant I work for shut down for a week due to historicly low sales in this period, and I've already gotten a bit bored of not working. However, it's because I legitimately (my own fault) did nothing. Given a longer time span I'm sure I would have started focusing my energies into something creative or any number of hobbies that I wouldn't have considered otherwise. So long as our needs are met as humans there's a billion ways to feel satisfied without work. Build something, create something new, see something you never have before. I really think I'd travel, given the time to do so, and assuming the "post-work" world gave me the means, in whatever way.