I'd also say that one might do well to explore it, even if you don't plan to use it for everything. I'm definitely a Lisp neophyte (Scheme in college, no Common lisp, and then ~6 years with some lisp-like proprietary framework), but there are some things I really miss from it.
As some have said, it's worth learning because of the way it can change the way you think about things. It sounds hokey and trite, or like someone's trying to be smug ("I'm in the secret lisp club!"), but I genuinely feel profoundly grateful to have been exposed to Lisp. (To be fair, I also really like programming in Python for _many_ of the same reasons I enjoyed programming in Lisp.)
As some have said, it's worth learning because of the way it can change the way you think about things. It sounds hokey and trite, or like someone's trying to be smug ("I'm in the secret lisp club!"), but I genuinely feel profoundly grateful to have been exposed to Lisp. (To be fair, I also really like programming in Python for _many_ of the same reasons I enjoyed programming in Lisp.)