This is tediously rehashed in every. single. thread. about tabs (someone's always gotta have a problem with someone else), but the fact is that some people have lots of tabs open while others don't. For me it's because bookmark management is such a forgotten child in all browsers, so I leave tabs in order to read them later.

The address bar used to be pretty helpful in calling up bookmarks (10+ years ago), but now there's too much featuritis there for me ever to rely on it again.