I saw another post debating "Unix is IDE", and though I am an avid vim/linux enthusiast, there is no denying re-factoring is a pain, and relying on grep/sed might prove disastrous on a large code base.

codemod is a regex based interactive refactoring tool. It allows confirmation for the substitution(yes/no), as well as opening the editor to make manual changes. It's a sweet spot between tedious manual refactoring, and possibly incorrect automated refactoring, especially for dynamic languages.