It helps if you use tags more than folders for bookmarks, that way you can have a page marked as "dogs, computers", another as "dogs, pizza" and then filter to dogs to see both. It also helps (in firefox) if you know the special symbols you can put in the address bar for filtering. * for normal bookmarks, I think + for tags, and % works for open tabs. Follow them with a space and your keyword.

I've been using qutebrowser mainly for a couple months now, and I find the way bookmarks and quickmarks fit into the standard open or open in new tab dialogue feels very powerful. I often am just hitting O to open in new tab, typing a few characters, and picking a result from bookmarks or history. Searching and going to a URL happens there too. I try to use either descriptive names like "guix-bug-issue" for quickmarks so they show up when I type any of those bits (bug and issue intentionally redundant so if I think to search either, it comes up), or I use very shorts strings like "lfm" for my last.fm profile. In the case of these shorter ones, you get the added advantage of being able to go there without looking. If you type an exact quickmark name in the box and hit enter, it goes straight there, you don't have to wait and look over the suggestions in the box.