I dev on a Mac, I'm anti-Microsoft through and through, and I thought the same. But seriously, their Mac version of Visual Studio (which I use) is now mature and I think in parts thanks to Microsoft taking steps to support bash, the ruby support so far has been great if you add the appropriate add ons. https://www.visualstudio.com/vs/visual-studio-mac/

Seriously as a ruby hipster I know all the love our community has in hating enterprise IDE's, then I grew up and realized they give you out of the box amazing functionality (like dynamic runtime variable value inspection and automatic app-wide class name refactoring) that makes manual refactors look like amateur hour.

These features are so powerful that I implore any Ruby dev using Atom or Sublime to at least give RubyMine a look if they don't want to give VisualStudio a look. You will be a stronger and faster programmer having them in your toolkit. Especially, and I repeat ESPECIALLY, for refactors of class names.