I am not sure about that. Not in the sense of gaining wisdom as would be in case of, say, Lisp or Haskell -- or even C. C++ is all just nuts and bolts, a more or less coherently implemented collection of paradigms originated in other languages. It is very useful from the practical standpoint, no doubt, but being "worth knowing", "superficially" - not so much IMHO.

Thankfully Qt doesn't go very deep into C++. I've shipped entire GUis without a single template.