And I definitely do not know of anyone who programs in VB6.
However, I am some what familiar with John Carmack. I would consider him a genius programmer. Yet he uses C++ almost exclusively. You would have to ask him if he thinks it's the most powerful language available to him. However, I would hazard a guess that his choice of C++ was incidental (http://rome.ro/smf/index.php?topic=3086.0) -- it just happened to be the de facto lingua franca for developing graphics intensive video games.
By orhtogonality I mean to imply that attributes of one are not affected by the other. Lisp is and will continue to be a powerful language with or without genius programmers using it. In fact, if genius programmers are exceptional and rare as we say then I would imagine Lisp has developed over the last fifty years almost exclusively without the help of geniuses. Similarily, not all geniuses will think to use Lisp; yet they will still be exceptional programmers and produce exceptional software.
Update: Included link to thread about an alleged response from Carmack to an email asking about C++. Apparently he uses it and has used it since Doom3.