I really don't get it. I'm honestly confused about what all the fuss is about.

For the most part the plugin gives you a way to insert blocks of content within a post or a page. That's all. Some of the components are features (images, video) that are already in the wordpress editor by default anyway. Some components (chapters, maps) simply don't work very well.

I can see this maybe becoming useful in some future iteration. But for the moment it's simply easier to customize page templates.