This isn't really the case. Some libraries are all macros, some libraries have no macros, but most have a few macros that quickly fall into general patterns: so

This isn't really the case. Some libraries are all macros, some libraries have no macros, but most have a few macros that quickly fall into general patterns: some macros for setting up and tearing down context safely (with-thing macros), others for iterating some data structure without revealing its internals (do-thing macros), generally simple stuff.