Longer answer: IDE? No thanks. At least, I've used Eclipse variants and various Visual Studios, but they map onto how I think about writing and managing software. I want a blank screen with lots of keyboard shortcuts, some basic autocompletion, perfect syntax highlighting, maybe some Git support, etc. I don't want code generation or any refactor-all-the-things functions; I won't be using them.
So one day I decided to revisit Emacs. Hey! It grew a package manager! Since that afternoon, I've had zero desire to look back. Emacs will outlive me and my children, will support every new language and tool that comes along, and will always be Free. There's nothing out there good enough to make me consider switching.
PS, in concession: I could make the same cases for Vim and its grandchildren. Once you've learned them, if they do what you need then there's very little compelling reason to change.