SlickEdit. I have used and loved SlickEdit since 2005, both on Windows and on Linux. I also have experience working in Visual Studio (5, 6, 2003, 2005) and just with Emacs and command line. I use SlickEdit with external makefiles, some of my teammates use SlickEdit, others use Emacs/vi. I do not use the integrated debugger, integrated version control, integrated build system: I generally find too much integration to be real pain. SlickEdit is robust (very few bugs), fast and intuitive. It is like a German car, a driver's car.
The newest versions of SlickEdit seem to offer many features that do not interest me, I am a little worried that the product will become bloated and diluted in the future. For now (I use V13.0) it is great.