It simply hasn't come up: none of the teams I've ever worked on have chosen CMake. I've certainly encountered & compiled libraries which use it, but I've never had any reason to edit a CMakeLists file myself.

Of course CMake has only really been a practical tool for 20-ish of those 30-odd years, and "Modern CMake" was only published twelve years ago; it's definitely gained a lot of popularity over the last decade, but the idea that CMake is the default C++ build system, not just one among many, still feels to me like a recent change.