I guess you missed the part I have spent 10 years using it.
In debugging, Eclipse is no difference than Emacs; both use GDB. For compiling, Eclipse also uses external debugger. The only thing that makes it an IDE is its internal parser, that is broken for large projects and Emacs also has a C/C++ parser anyway. What make Emacs less IDEish than Eclipse?
Except I only use CDT with Android. GDB is no match to Visual Studio debugging capabilities.