Look again amigo, I am sad to say that a huge portion of those are dead links now which exist only in your memory. It's like getting internet blueballs when you click on something you were once excited about and now it redirects to some shitty hosting service page or a 404 page with a cutsie image and caption. If you want to really keep something, you have to save the page itself or make a pdf of it.
My watch later is so big; it breaks whenever I add a new video. I have to manually go into the playlist, change it from recently added to a different listing order, then back to recently added for it to show anything I've added since the last time I've done this.
Been maintaining a steady set of bookmarks since whenever Foxmarks first came out. I dunno I search through them fairly frequently for stuff that I can't remember well enough to Google.