At work and play I use only vim to write C++, Python, Javascript, bash and web frontend stuff. Only plugin is rainbow parentheses. Manpages and web for docs. My system is very flexible and I wouldn't have it any other way.
So besides not having intellisense, you also don't have things such as go-to def/decl, show type info, switch between header/cpp files, etc... Not to mention debugger integration, right? Do you work on large scale projects with this setup?