Completely agree. I wrote a blog post about it a while back [0], but to me the killer feature is being able to pin items as to-dos (or create new todo's unassociated with an email), and then flip the switch so that you ONLY see these pinned items.

I love it because I can only look at my pinned items and focus on knocking a few out at a time, and only occasionally flipping back to the regular inbox view. (Which I find distracting when I need to focus.)

[0] - http://blog.jedchristiansen.com/2014/12/02/the-super-magic-p...