Some people dream of becoming millionaires, living in huge houses and driving fancy cars

I think this is what most people "want", or think they want it, and I think it is mostly because it is flashy. While on the other side there are people who have money and are only interested in living a comfortable life, which is a bit boring and not so attractive for posting on social media. But it could be better in the long term.

Comfort also means choosing what I want to do with my time

This is such a great point. Having enough money gives you some kind of freedom and peace.