Yes, it works!
We've received a lot of requests related WordPress Admin use-case. And we've created a UserGuiding WordPress plugin to make it work!
You can take a look at the following article & video to learn how to implement UserGuiding on WP back-end.
Here is our plugin: http://bit.ly/ug-wp-admin
Implementation article: How do I install the code snippet on WordPress?
Implementation video:
https://www.youtube.com/watch?v=KkyKNFBWzdU