What you're saying contradicts the descriptions of hedonism. You have the idea it's an is/ought fallacy by conflating psychological hedonism and ethical hedonism.
Psychological Hedonism is the view that humans are psychologically constructed in such a way that we exclusively desire pleasure. Ethical Hedonism, on the other hand, is the view that our fundamental moral obligation is to maximize pleasure or happiness. It is the normative claim that we should always act so as to produce our own pleasure.
https://www.philosophybasics.com/branch_hedonism.html
It's ethical hedonism that the phrase "stop worrying and enjoy your life" represents - which is a normative claim. It's not derived from what people do or R. Dawkins wouldn't have been driving that bus around with the slogan on it.
Lion IRC conflated it with short-sighted self-interest. You agreed with the conflation and used it for your "parallel" with objectivism, saying they're both is/ought fallacies.
Read the link, it has more on the philosophies that got mixed together into a stew: what Egoism is ("the claim that individuals should always seek their own good in all things") and what Epicureanism is ("[a moderate approach which] seeks to maximize happiness, but which defines happiness more as a state of tranquillity than pleasure").
I see no good in "a good life" that's based on self-interest either. Which is why I admire Epicurean hedonism. It's about simple living, mutuality, and a prudent approach to finding joy.
Christianity has a 2000 year history of lies regarding hedonistic philosophies, and it's had its ugly effect on people's ability to understand and discuss them. Whether in agreement with hedonism or not, it deserves an evenhanded presentation before criticism.