some people LIKE to work and enjoy what they do! They enjoy the sense of purpose and social interactions. They would be bored in early retirement and feel lost. Really!
Anyone who says this has clearly missed the point of this website, so let me spell it out for you.
"Sense of purpose" is a bad reason to be a wage slave. You can find purpose in life a million different ways. Volunteer for the United Way. Walk dogs at your local animal shelter. Teach a child how to read. I seriously doubt your cubicle or office offers the best and highest purpose a human being can find on Earth.
"Social interaction" is a bad reason to be a wage slave. Do you think early retirees sit home alone all day in darkened rooms? Quite the opposite, they are free to choose their activities and their company with complete discretion, unlike the office worker who is forced to spend 1/3 of his life in the company of people of someone else's choosing, in a place of someone else's choosing, doing work of someone else's choosing. Do you really aspire to be told what to do, and when, and where, and with whom?
It's great that you love your job, I love mine too. But would you do the exact same job if you won the lottery?
Very few people, if being honest with themselves, would claim they would continue their current jobs if they never needed to worry about money again. They would at least change some small aspect of it, or give up some part they don't like very much.
Most of humanity, for most of history, has been obligated to follow orders given to them by people more rich and powerful than they are. We live in a unique moment in history, one with such abundance that everybody born in a westernized nation is finally capable of breaking free from this kind of slavery. And yet people keep showing up here to claim "but I LIKE being a slave!"
Work is great. Purpose is great. I recommend everyone strive to find both in their lives, as much as possible, and to do so in such a way that your freedom and your economic well being are not dependent on continued obedience. I am skeptical of anyone who claims he has achieved perfection in both their work and their life's purpose, and even more skeptical of anyone who claims to have found it while being ordered around by a pointy-haired boss.