What I've come to learn is that only technologists care about what particular languages you know. Depending on what you do (me, web app development), your audience may not care at all. I can tell you the nurses who use the system I developed could care less about the language. All they want is to get at the data they need, when they need it and have it be as simple as possible to use. For that to happen, I have to know what they need. I have to understand why they need it. I have to learn to think like them.
With that said, and from that perspective, I would counter the advice given with: learn your business. The languages come second.