Despite the sassy response in the FAQ about Vim keybindings, I am planning to implement Vim keybindings for micro in the next version, along with an improvement to the keybinding system in general. Stay tuned for 2.1.0 which I hope will include this feature.
Mostly so that I can use Vim keybindings with micro :). Hopefully after improving the keybinding system, it will be fairly easy to implement a Vim plugin, so it shouldn't take much time. Of course, the Vim plugin will be optional and not provided by default, but I think it would be nice to have, and would make me more efficient with micro.
I use 'vanilla' vim on my servers, and I dislike the defaults enough that it bothers me, but not enough that I've ever gone through the effort of setting things up.
Micro would be perfect in my situation, because I'd get something nice out of the box and still be able to use my vim bindings :).