Why is taking a foreing launguage so important?

Some people believe speaking one language is enough, but for me it isn't.
When I just to live in Mexico I really saw no point in learning another language, but when I moved to the US, I realized how stupid you can look and feel for not understanding a thing people say to you.
Now I guess you can call me a language freak, trying to learn as many languages as I can. I think its so important and interesting, with language you learn about new cultures, accents and its easier to communicate! I now know English, Spanish and want to learn FRENCH!