I’m a long time lisper. Learned Haskell ... a couple of times now. It’s interesting and in some cases fun and elegant. But I just kept coming back to Lisp for actual work. Lisp just seems to be at the sweet spot between functional, extensible, and work-a-day, and the parens just make the refactoring experience so fluid that it’s like a drug. (Edit: I want to learn clojure, which should be easy from Lisp. I’ve avoided it bcs the JVM makes me nauseous. But I’m told by my cj-loving ex-lisp hacker friends that you don’t need the JVM. So maybe I’ll try again.)