> I feel like if I used it, it would atrophy my skills in other more traditional languages.
If your skills in other languages are tied to a syntax then you never had any skills to begin with. I've used pretty much every syntax (and too many languages) out there and the only difference I've ever found is that ML syntax is nicer for automatically curried functions and LISP syntax is much nicer for meta-programming. The rest is effectively all down to paradigms, runtimes and libraries.
If your skills in other languages are tied to a syntax then you never had any skills to begin with. I've used pretty much every syntax (and too many languages) out there and the only difference I've ever found is that ML syntax is nicer for automatically curried functions and LISP syntax is much nicer for meta-programming. The rest is effectively all down to paradigms, runtimes and libraries.