Since you asked:
I personally don't really like using menus and found that radial menus didn't change that feeling.
I remember Opera adding radial menus at one point some years back. I excitedly tried them out but they weren't as sexy as they had sounded.
I'm a huge fan of mouse gestures in the browser (Opera, Firefox, ...) but that didn't translate well into the text editor. jEdit supports mouse gestures but I found that I never used them. Web browsing is pretty mouse-centric so using mouse gestures comes naturally.
Also, I figure that deciding what to include in a radial menu in Sublime would be quite difficult to calculate. You only have a few slots in the menu (8 in your screenshot) and different people would want different things to be offered (although configurable menus might help with that).
My biggest concern is that using a text editor is a very keyboard-centric task but radial menus are very mouse-centric.
I'm very happy with keyboard shorcuts for the things that I use frequently and a few menus for infrequently used commands.