To me, it seems like a lot of these light-weight Non-IDE text editors, are basically IDEs anyway. You just said sublime and Vim have most of the features of an IDE.
I personally use RubyMine, and while I don't use the debugging a whole lot, it comes in handy with some really confusing issues. Other than that, it is just a fancy text editor that I have become used to for Ruby work.
For ruby stuff, Vim really shines, mainly because of tpope's contribution and his excellent ruby plugins. Along with his Fugitive (https://github.com/tpope/vim-fugitive) plugin, it's actually fun to use Vim for ruby. It's just fantastic. Check out his vim-rails and vim-ruby plugins: https://github.com/tpope
I personally use RubyMine, and while I don't use the debugging a whole lot, it comes in handy with some really confusing issues. Other than that, it is just a fancy text editor that I have become used to for Ruby work.