What if Lisp and Lisp-like languages are simply better or more enjoyable than most other programming languages? The core features of Lisp or Scheme are also very simple. Common Lisp spec is frozen so your all programs just work. Some languages keep on breaking old code. But this doesn't mean that Common Lisp is obsolete because you can extend it and new useful features that are integrated seamlessly with the rest of language.
I haven't used any other programming language that's as coherent as Common Lisp or Scheme. Because of this (and the fact that Lisp syntax is same for almost everything), Common Lisp and Scheme tends to have less mental overhead than many other languages.