Of course there are lots of ways to locate a link in the bookmark tree. However, the GUI-style approach is nearly impossible to be faster than the CLI-style way. I believe that most Linux (vi / emacs) users and RTS game players will agree with me.
The shortcut key is just the "CLI-style" operation that is more and more difficult to find in today's GUI applications. When an ordinary user is moving his mouse onto the address bar and moving his right hand back to keyboard, it's done in Opera 12.17. Isn't it cool?