Anything is overstating it. I use boost pervasively, and Clion has no issue with most of how I use it. But it certainly does choke on some of it, especially the function and variant stuff. What are you seeing it choke on?

I haven't played with QtCreator lately. Clion has, over the past couple years, become my favorite C++ IDE on Linux because it can consume my hand-written cross-platform CMakeLists.txt and give me a nice experience, and because the debugger is really good IMO.