There are companies selling Common Lisp interpreters and IDEs. So certainly there are lots of users out there.
Many major Lisps (CL, Clojure, Scheme, Racket) are general purpose languages, and in common they excell at metaprogramming, interactive programming and control flow/debugging (see CL restarts).
It's an interpreted one in the sense that one can continually interact with it during the life time of a program. Many of the popular interpreted languages nowadays do some compilation somewhere (Python, Perl, etc).
Many major Lisps (CL, Clojure, Scheme, Racket) are general purpose languages, and in common they excell at metaprogramming, interactive programming and control flow/debugging (see CL restarts).