Not every task ended up being worth doing, but some sure did. And regardless, more important than any one individual tasks, I earned a reputation with management. This in turn resulted in a steady stream of bonuses, stock grants, and promotions. I suppose I was doubly-fortunate to have focused my efforts in the tech industry from the early 90's onward. You have to be really unlucky for nose-to-the-grindstone efforts in FAANG companies to not work out pretty well for you from 2003-ish until today.
With continued good health I can look forward to another 20 or 30 years of life, where I get to do whatever I want with my time because I earned so much money being content to conform to whatever my employers required of me. Nobody will remember my name, but that's okay with me, because I won't either.