Having gone through a handful of periods of a few months where I wasn’t working and was also not engaged in an existential struggle for survival, I have to disagree here.
Personally, I know that I need a focus for my intellectual life. It needn’t be employment, but “work” is a fair way to describe it. I can spend two or three weeks idling most of the time, but after that I need something to direct my energy and concentration toward. I need a goal that stretches my abilities, or I find myself constantly battling a depressive spiral.