Which languages makes all the difference. It's more important to know at a language from a broad number of paradigms, rather than knowledge of a bunch of C-syntax-derived object oriented languages (I say this, but I'm just as guilty of it as many others, despite trying to rectify it).

Frequent usage is more difficult, though. I'd like to think I know C++, Java, C and Python all very well, SQL to a reasonable level. However, add the "dabbling" languages: Racket, Haskell, Scala, C#...where exactly would the time for using these frequently come from?

Arguably, languages are only important to an extent - libraries surrounding languages are the truly important part.