Lisp is worth learning for the profound enlightenment experience you will have when you finally get it; that experience will make you a better programmer for the rest of your days, even if you never actually use Lisp itself a lot.
Eric S. RaymondToday I am one of the senior technical cadre that makes the Internet work, and a core Linux and open-source developer.
Eric S. RaymondThe Wesnoth devs are good but not exceptionally so, and we're weighed down by a crappy implementation language (C++). Nevertheless our productivity, in terms of goals achieved per hour of work, is quite high.
Eric S. Raymond