Plus, if you're looking to build a cross platform GUI app, Qt is a great toolkit, and Qt Creator (as the name suggests) supports drag&drop UI building, QML etc.
I find that compilation in Qt Creator is possibly slower if you are on windows (using mingw) but on Linux its around 10 times faster (through the use of ccache and make -g4).
And the documentation is awful. I still haven't figured out how to make precompiled headers work with clang (but that may be my fault).
There is a relatively new clang based vim plugin that I haven't tried yet. Using clang to parse C++ into an AST is the right approach, so it sounds promising.