The older I get the less I want to be a polyglot. Or at least the meaning of polyglot changes. I used to love learning every new language that I came across, but now I find less value in doing that. I find it too time consuming to learn new languages and I'd rather be creating things. It's difficult enough to create things in your spare time with the languages you already know. It's enough for me to know one language of each of these types: one statically typed OOP, one dynamic OOP, one functional. Being strong in 3 of those and employers will see that you can learn whatever it is that they use. In your spare time, do what you enjoy, if ColdFusion is that, use ColdFusion.