I changed my intended college major from biomedical engineering to neuroscience+compsci.
I give more money to better charities than I probably would have otherwise.
I have a regular exercise habit that I cultivated with ideas I got from LW.
I might never have read Gödel, Escher, Bach if not for LW.
LW recommended Good and Real, the book that convinced me to become vegetarian and then vegan.
I’ve picked up various other good habits of thought, and a much better understanding of metaethics, but those are the concretely visible ones.
ETA: also, LW convinced me that I should sign up for cryonics, but I haven’t yet because I’m still in school and don’t have the money, so I don’t know if it counts.
I wanted to do research that would have practical implications for the human condition, and I thought working on genetic diseases was the best way to do that. Various lesswrong memes convinced me that working toward uploading by advancing neuroscience was a better alternative. Also, the exposure to cognitive science on LW and the idea that human intelligence is the Most Important Thing made neuroscience seem a lot more interesting. I can’t say much about the comparison, since I changed my plans while still in high school, but I’m glad I did it. For one thing, if I hadn’t, I wouldn’t have discovered how much I love to code.