I love the stl, it's almost always the best thing to use in C++ (wrt Cost/Benefit, love me some vectors). My comment was geared to someone who does "Java, C#, Ruby, Python, [and] JavaScript" programming. The most notable omissions in the c++ stl is GUI stuff, which comes standard in C# and Java.

As an aside, TDD and refactoring also aren't as mature in C++ (vs Java, C# and Javascript).