That perspective is, I think, most applicable to Lisp. Because the syntax is so simple, language-level constructs in Lisp appear identical to user-defined constructs - it's all just macros or functions. From the perspective of someone using what you've provided, there's no difference between calling your functions and calling Lisp built-in functions. The ideal is that the application logic will be relatively high-level, only calling these utility functions.

Note that this is different from overloading the same name to mean different things depending on context.