Moving to new C++ is a non event, change the compiler / flags and done. Using the new features requires some learning but not a big deal since you can figure out what you need from a summary and learn what is useful for your problem.

The problems of the code I'm writing far exceeds the complexity of the language. Your complaint about complexity fall flat to me, unless you are working on a trivial program you need to deal with things far more complex than any language.