Typically AutoCAD users are not AutoLISP users. (By the way, AutoLISP conses are also immutable, although you have complained that the immutability and resulting "persistence" of Clojure lists counts against calling it a Lisp.) But typically Emacs users are indeed Elisp users, because they read, write, and modify Elisp code. That's why there are several thousand Elisp repositories on GitHub.