A lot, I am only writing C or C++ for new code when it is unavoidable, like existing code bases, bindings or tinkering with runtime implementations that aren't bootstraped.

Mobile platforms, distributed computing have long moved the spotligh away from C and C++, other than language runtimes or existing products from the 90's like SQL servers, and naturally UNIX like underlying OS, which most userspace developers aren't writing new code for.

Naturally there are domains like LLVM/GCC, console game dev, HPC/HFT where they are unavoidable for new code.