Definitions matter, 18% of American households are millionaires. Many of them live just as you describe.

Ultra wealthy is likely much higher. Let’s say $100 million or more. This is unlikely to happen overnight (in the literal sense.)

I don’t see how it wouldn’t change you. Even giving the money away would change your time use. (If I gave away $10 million, I would be checking on how it is used. And be very critical.)

Even just removing annoyances will change you. A nicer car, then why deal with traffic. Food prep turns into no going to the store, which turns into not knowing about advances in checkout scanners (see George HW Bush during some election.)

Maybe it is not your not changing. The world always changes. Will you change with it?