Yeah that "enjoyable" state is kind of difficult to describe. My experience may be different than yours but for me it's an emptiness of being in tranquility with the chaos of my own thoughts. Only with deliberate practice. To me "work" does not mean suffering but directed concentration and discipline. If I accept my mistakes and imperfectness of that "work" the process to me is "enjoyable". But the "joy" is difficult here because it's not really that exact emotion.