I'm the author of the linked post. I'm not sure what you're specifically interested in as coming natural, being productive, and giving joy are largely subjective reasons for preferring a language.
For example, I can say in Lisp it's easier for me to start writing and evolving programs which in turn allows me to produce more code than in other languages. As for the joy, it comes in part from the instant gratification of a low friction environment where you can evaluate -- and see running -- anything from an individual atom to a full program.
For example, I can say in Lisp it's easier for me to start writing and evolving programs which in turn allows me to produce more code than in other languages. As for the joy, it comes in part from the instant gratification of a low friction environment where you can evaluate -- and see running -- anything from an individual atom to a full program.