My chrome bookmarks are one of the 3 pillars of my cloud identity, along with my gmail and my dropbox. You could just say my google account and my dropbox.
I have hundreds of bookmarks, covering dozens of categories of research and reading. One of the largest subcategories includes hundreds of references that I may or may not need for future projects including software (stackoverflow questions, tutorials, bug solutions, framework and API references, optimization articles, in-depth guide articles, and so on), woodworking, economic/governmental/civic/legal research, fitness, electrical engineering and general circuity/wiring, real estate, recipes, piano repair, audio production, and so on. These are all intended to be kept until needed, most likely indefinitely.
Then there's a category for more temporary things that I need in the moment and am unlikely to need again, including news/blog articles I haven't gotten around to reading yet, solutions for bugs that I need to fix, torrents I haven't gotten around to downloading, and collections of references for small, specific projects that I won't need again afterwards.
So basically I use Chrome bookmarks as my personal address book for "things on the vast internet which I wish to return to eventually."
For major things I use daily, like youtube or gmail or facebook, I don't bother bookmarking them-- for those I just use the address bar's semi-intelligent autosuggest....Ctrl+L to go to address bar, then I just type g and hit enter, or y and hit enter, or f, etc. The only website I need to type out beyond 2 letters is twitter/twitch.
I guess this may sound odd, but Chrome has begun to feel like a natural part of my mind. The bookmarks and my gmail are an extension of my memory. My interactions with the net are an extension of my thought processes. I have seen other people make similar remarks about their phones.