People have used Lisp cleverly, but most modern libraries are a bunch of functions and classes. Sometimes more foreign features are used, like macros or even reader macros, but they do so to help one express him/herself. Even the open source Common Lisp compilers, written by arguably the lispiest of Lispers, don’t have a lot of “cleverness”. Check out SBCL, CCL, or ECL.
Some of the prolific library writers—Weitz, Fukamachi, Hafner (aka Shinmera), Strandh, Beane, etc.—all produce good libraries and good code, and aren’t at all as you describe. Check out Hunchentoot (a web server), Clasp (a new CL compiler), CL-PPCRE (regex library), Radiance (a web framework), Quicklisp (package manager), ... These are all easy to jump into and relatively easy to understand if you know the domain.
Even if you go back and look at the Symbolics sources, there really isn’t a lot of cleverness.
If the complaint is that some lone wolf programmers write obscure code, then I’m not sure what’s to worry about. Somebody’s lone wolf code isn’t what you’re going to be importing or depending on.
I hear this opinion you state somewhat often by drive-by comments, but I never see examples, just anecdotes.