What code editor use and why? I Use Sublime Text because for me is the best editor with The Package Control and the fast of the editor, and the multi-plattform (Windows,OS X,Linux)
For me it really depends, as i am working as an OS developer so i usually have to deal with huge gigantic projects, such as ubuntu source code, or Linux full source code, and as experienced opening such projects in IDEs such as Visual Studio, or any similar ones (don't remember the names) really caused them to crash and most of them didn't even successfully manage to open those big projects, so instead i use Eclipse for C/C++, it's a great IDE, has syntax highlight, editing snepits, code referencing, advanced files and code indexing, which makes it easier for me to work with giant projects without the need to really re check my projects files always to see if i inputted a method's name correctly or didn't. plus the surprising fact that eclipse being made using Java, somehow the IBM group behind it really managed to control memory usage, and it consumes less memory while opening 10s of giant projects at the same time (each with 10s of millions of lines of code) than Visual Studio when opening a tiny .NET project or worse opening an MFC C++ project.