According to Abelson, Greenspun and Sandon, Ousterhout's love was a touch impure & practical. Per the slightly rueful historical assessment at the end of their Introduction to Tcl for Web Nerds:
Lisp Without a Brain
If in reading this introduction, you've come to realize that "Hey, Tcl is just like Lisp, but without a brain, and with syntax on steroids", you might wonder why Lisp isn't a more popular scripting language than Tcl. Lisp hasn't been a complete failure, by the way; it is used as an extension language by users of some popular programs, notably AutoCAD. But Tcl has been much more successful. It has been compiled into hundreds of larger programs, including AOLserver, which is why we wrote this book.
I wonder what "Perl Without a Brain" would be?