I use mostly Vim / IntelliJ IDEA / C9 (locally installed). Sometimes Emacs, which is the best of the best, but I still can’t find time (since the last year) to repair my configs, which made Emacs running veeeery slow over time.
Vim - when I need to make/see something quickly. C9 (it is really well balanced IDE - scoped find/replace, visual git support, very fast) for the most of the small to medium Meteor projects. IDEA - for larger projects and for mobile development (React Native). JetBarins products have really great find/replace, git support, autocomplete and refactoring, but there is the price for it - CPU-hungry reindexing. And It’s a pity that IDEA lacks ObjectiveC/Swift support.
As for Atom, I have it installed and use it sometimes to edit markdown files (very nice preview there).