@Lurt,
I think it is awfully beneficial. Learning a seconds language opens your mind. It forces you to realize that there are different ways of looking at things and different ways of expressing things.
And, it gives you a view into another culture and the rare opportunity to step out of your own cultural context into another. Having the ability to see things from more than one perspective is very valuable, particularly in an international business setting.
If I owned a business, I don't think I would make a second language a requirement. But I would consider a second language as a very big plus in anyone I was considering hiring.