I speak four natural languages. I don't love the analogy, because I think differences between computer languages are more significant than differences between natural languages. That said, there are still more differences than just who you can speak with. Example off the top of my head: if you think in Mandarin, the future is behind you and the past is in front. You mention actions being the same, but the way you think about actions will be very different if you think in a language with few tenses (Mandarin) compared to one with many (Romance languages).

Obviously both computer languages and natural languages have some things in common, but they also have significant differences.