At first, I was skeptical about the business course. The importance of business communication skills was not immediately apparent to me since I had never worked directly with clients. After studying business Japanese for a while, I was surprised to find that I had an easier time understanding the Japanese around me. The fact is that the staff's communication with the visitor, notices, announcements, and other everyday things are filled with formal Japanese, the so-called "keigo". Even if you don't need to speak business Japanese at all, understanding such a language will come in handy and Linguage would be a great help.
P.S. A special thanks for the business letters class. It made communicating with recruiters a lot easier and generally increased the chances of successful employment considerably.