Installation

Git-clone this project into your ~/.config/sublime-text-2/Packages/ folder and restart ST2.

Usage

Press Ctrl+Alt+Y(Super+Alt+Y on Mac) and start typing Yaml key names.
Example:

hello:
  nice:
    world: Hi
goodbye:
  cruel:
    world: Bye

Just type ni wo to get to the nice world line.

Disclaimer: This is my first attempt at writing a Sublime Text plugin and any Python code at all, so any improvements are welcome.