What is your Wordpress theme development process and workflow like?

I may have some undisciplined habits when developing themes for Wordpress. Maybe. I'm currently becoming more familiar with PHPStorm and using it's built-in Wordpress features and want to create a theme development process that is streamlined and efficient.

What do you use? Do you use Gulp, Grunt, Vagrant, Eclipse, MAMP, etc?

How do you organize your project files?