The only reason to learn esoteric languages such as Scheme and Haskell is to feel smart and look smart. Feeling and looking smart is important for those smug holier-than-thou programmers. However, if you want to do practical things rather than spending time to inflate your ego, it is much better to program using Python, C++, Java, and all the other mainstream languages. Use existing libraries, and stop reinventing the wheel. Be social, and stop using those one-person languages. Use mainstream languages that make teamwork and large-scale cooperation easy.
The "shut up and calculate" approach in physics is also applicable in programming. Instead of wasting time evangelizing your favorite esoteric language, simply shut up and start producing practical code in a mainstream language. Over time, you would have produced far more practical software than the programming language evangelists and idealists. Actions speak louder than words.