Tbh the main thing I dislike about slaving is waking up for a morning shift, as I never really sleep well on those days. Later shifts are totally fine, and if anything I kinda feel okay at work, as my mind is occupied on something and at least I'm doing something somewhat productive rather than just rotting.
So far it's been 5.5 months and I don't miss being NEET. The issues are that I couldn't progress towards things I wanted as a NEET, the seemingly unlimited time meant that I didn't really value it, that I accomplished essentially nothing for almost a decade, and by the time I got a job it had been a long time since I could consistently enjoy my copes anyway. If I'm miserable half the time or more anyway, then I'd be better off just having a job, and in the worst case getting paid to be miserable. But I rarely feel bad at work.