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Brilliant Alatar!
I seem to remember from the Hobbit that Rivendell was pretty well hidden - even Gandalf struggled a bit finding the way. We don't get a description of the last stage of the hobbits' journey in but they were with Glorfindel and Aragorn who obviously knew the way. The Dunedain would probably know since they were semi-based there but I doubt its exact location was widely known among non-Rivendell elves. Legolas probably knew through contact with Gandalf and Aragorn re Gollum's capture (if not from family connection with Celeborn who had lived there a while).
Boromir found it either because he was "meant to" or because in such times the elves were not complacent enough to rely on geography and enchantment and set a watch and found him. We know that other elves than Glorfindel were sent out to look for Frodo - maybe one of those found Boromir in the vicinity.
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