I don't know if they enjoy life itself. They definitely enjoy some things in life, like friends, family, hobbies.
And I think I would definitely enjoy life if my brain wasn't so flawed. I think something is wrong with my brain as meds and narcotics don't work on me. Some sort of chemical imbalance. That's cruel but some people are genetically predisposed to depression and combined with environmental factors, it can lead to unexplainable intense suffering. For my part, I was already depressed when I was 10, but it got clearly worse when I experienced SA from 11 to 14. And when I say worse, that's muuuuuch worse. I think that's the main reason why I'm so suicidal. I'm scarred for life.
But some people have grown in a healthy environment and their brain has correctly developed. Of course they should hate working for the sake of making their boss richer (that's all the point of working, read Marx lol). I fully understand why you don't want to be a wageslave. But working has a great advantage: it can help you become a fully integrated member of society. Sure, you can reject it, but most people want to be part of society because that's what gives meaning to their lives. They feel useful. And that combined with having a family and friends, makes their life fully enjoyable.
However, it also depends on what work you do. Shitty jobs for the sake of surviving, i.e. eating and paying the bills and rent aren't as fulfilling. You can work and be very isolated at the same time. I think you can't enjoy life as much in this case.
(I think, though, that you can live a fulfilling live outside of society. Spending time creating art by yourself, for example. But most people need to be among fellow humans.)