How is Bilbo the hero in figuring out the clues?

In Chapter Eleven, they reach the mountain, and it is clear that Smaug is still alive, for his smoke is all about the place. Bilbo, once again, is the hero, as he manages to lead them up the mountain and successfully decipher the runes of Thorin's map. But after this, Bilbo has to find the correct path; and after this, Bilbo has to find the doorstep. The dwarves may be excited about the treasure inside but they are not excited enough to enter the cave on their own, and so Bilbo must enter alone.