I think I'm missing something here. You want 100s of pages accessible from a vertical list, but are happy to wait for them to reload when you re-open one... aren't you just looking for a bookmarks list?
Yes, the author says that he doesn't like bookmarks because then they are hidden behind a menu but at this point he's basically recreated a list of bookmarks that is always open.
I also keep plenty of tabs open for things that I'm monitoring or want to get back to but appreciate that browser constraints force me to go through the tab backlog and either deal with the tab now or save it as a bookmark for later.
He doesn't even need the bookmarks, a 'history sorted by access date' would work just fine. IE 11 has the history explorer bar which you can choose 'today' and 'view by order visited today'.
In any case, he could use Sleipnir 6. It's got your hundreds of tabs open market cornered.
Bookmarks (AFAIK) don't store the state of input fields and such on a page, while tabs do (though they probably don't if you're unloading them on-the-fly). So, if you're jumping between, say, multiple pages with multiline text fields (perhaps when authoring forum/blog posts, for example), support for lots of tabs is handy in that case.
Also, bookmarks aren't quite as ephemeral as tabs, so there are different workflow implications.
I also keep plenty of tabs open for things that I'm monitoring or want to get back to but appreciate that browser constraints force me to go through the tab backlog and either deal with the tab now or save it as a bookmark for later.