My editor of choice is PHPStorm — a tool I couldn't live without. Using it gives me the confidence that my code is always as good as it can be. On top of that, the Xdebug integration saves so much time when debugging.
All of my plugins run on Gulp, Composer, npm, Sass, and jQuery. I've built a number of custom npm and Gulp scripts to automate a lot of my workflow, like compiling Sass, deploying plugins, updating version numbers, etc.
My stack is constantly evolving. I'm always open to try new things; I'll admit I already have my eye on VS Code!