I think Steve loved running Apple more than he ever let on. Is his form of happiness identical to your or mine? Probably not. Was he exactly where he wanted to be in life? Absolutely.
I think a better way to look at it is that money is no guarantee of happiness, but it usually doesn't hurt, can often help, and you're much more likely to be unhappy if you're poor/struggling.
I think it's more of a "it depends" It's everything to someone facing the crushing anxiety of scarcity but "meh" to someone who spent most of their adult life being able to buy anything they want.
Pretty much what I feel from reading Issacson and fact Jobs died rather early.