Knowing and using a bunch of programming languages, and also knowing and using several human languages to various levels, I'm firmly in the camp which says that these are totally, utterly different things. Learning a programming language is just as learning any other particular skill (though it's better if you have a programmer's brain, or rather, interest), while learning a human language is.. just very different. And tremendously more difficult, and it doesn't help that it's mostly a semi-conscious business, in fact "studying" in the general sense gives very little return.