Well, maybe it's a matter of naming here, because while of course they're very domain specific - an esoteric programming language is one that's rather not desig

Well, maybe it's a matter of naming here, because while of course they're very domain specific - an esoteric programming language is one that's rather not designed with usability in mind (but as a joke, or to prove some point etc). See http://en.wikipedia.org/wiki/Esoteric_programming_language http://en.wikipedia.org/wiki/Esoteric_programming_language or http://esolangs.org/wiki/Language_list http://esolangs.org/wiki/Language_list - noone would put Haskell under that category...