Just thought I would share this here. I’ve made a small Keyboard Maestro macro that will copy the text inside a text area, let you edit it in Vim, and paste it back to where it came from. Been using it for a little while and its pretty nice 
It was inspired by something Chris Toomey said on a recent episode of The Weekly Iteration.
I wrote a small blog post about it here, and you can download the macro here.