That's one of the main points of pg's "Beating the Averages" essay, where most people got the term "Blub programmer": http://www.paulgraham.com/avg.html
The visitor pattern is a good example, but I think another good one are classes. You can write object-oriented programs in C, but it requires that you, the programmer, enforce all of the concepts of classes (member functions, instantiation, inheritance, etc.) yourself. I think that is a clear example where more expressive/terse code (that is, language-level support for OO) requires significantly less juggling across the code base.
The visitor pattern is a good example, but I think another good one are classes. You can write object-oriented programs in C, but it requires that you, the programmer, enforce all of the concepts of classes (member functions, instantiation, inheritance, etc.) yourself. I think that is a clear example where more expressive/terse code (that is, language-level support for OO) requires significantly less juggling across the code base.