It makes a big difference to me. I use what you say sparingly for organizing, but once it's sorted, there are several shortcomings: limited horizontal space, the fixed presentation (it would be nice to add notes or images, change sizes, etc.) and in general the fact that it's an internal format that I can't manipulate.

To summarize: I don't want just a way to launch the bookmarked pages, but to create a page based on a list of bookmarks that can contain more than the bookmarks themselves.

A related feature (related for me anyway) is backing up pages. I use the extension SingleFile, but I would love to have a system integrating bookmarking, authoring and local backup.

I guess you'd understand me better knowing my workflow when I'm collecting information for some new topic: searches, visiting a dozen of pages, following links, selecting what's useful... the bits of information are spread across pages. I need to keep the links for reference (better with both the bookmark and a local backup), but often it's much more convenient to make a page with text snippets, maybe including images.

Anything that makes this easier is useful to me.