I guess I'm lucky I've only been doing a spate of C++ for about 18 months. In the early stages before ChatGPT it was a bit tough but I was also working with admittedly simpler code (less templated code). I have a decent grasp of C including virtually every compiler/linker error that a C compiler would spit out, so I could manage a lot of the superset style errors, but as more C++ work came in, the more inscrutable the diagnostics.