This does not mean that C++ is difficult. It just means that you may be used to easier languages, and your brain is not flexible enough to deal with C++.
Entrenchment. The main product I work on is 3.5 million lines of C++, built with MCF and ATL. We can frankestein other technologies into there, but its expensive and clunky. The cost of rewriting the whole thing is prohibitive, so C++ it is.