How do busyness and happiness correlate for you?

Scott Young's latest blog entry has got me thinking: am I really happy when I'm busy? https://www.scotthyoung.com/blog/2021/08/03/is-life-better-when-youre-busy/

About five years ago I was incredibly busy working for a startup and I loved it... but that happiness suddenly turned into overwhelming stress and I crashed and burned out. I'm still trying to find the right balance.

What mix has worked for you?