“C++ is designed to allow you to express ideas, but if you don’t have ideas or don’t have any clue about how to express them, C++ doesn’t offer much help.”
I accidentally found this one in a FAQ on Bjarne Stroustrup’s homepage.
C++ is a great language, but it is indeed not a magic bullet. Properly learning all aspects of C++ and -more importantly- learning how to design system architecture and then expressing that design in language features takes a long time. I have worked as a lead programmer on several exciting projects, but I wouldn’t call myself an architect yet.
But most importantly, just using C++ does not -by itself- cause you to suddenly create well-designed applications. With C++ you can do a lot of damage if you don’t know what you are doing.