I haven't done "slave labor" for more than 20 years, having initially imagined I was rich enough to retire at 32 (that turned out to be wrong), then later converting an open-source passion project into a very comfortable middle class living. No boss, no rules, no schedule, just lots of people who love what I do and that includes me.
However ... the Box of Daily Experience is still a feature of my life too.
There are plenty of days when I reflect on how it was just another day, same old same old, completely predictable. Granted, I don't have to put up with the BS of a regular job, which eliminates one aspect of the Box of Daily Reality for me. But then again, I work (mostly alone) from home, and so my days involve very little physical interaction with anyone. Equivalent to the suffering of slave labor? Probably not, but just a different element of my particular Box of Daily Experience.