Exactly. I liken things most often to metaphors. I believe
  humans only understand things via metaphors layered on top of
  metaphors.

  The more metaphors (or analogies) we use, the more we're able to
  comprehend.

  Good metaphors/analogies are functional; they "do stuff'.
  Numbers are a GREAT metaphor for stuff; they're very flexible
  and can describe many things very well.

  Words are great metaphors for stuff, also very flexible and can
  describe many things very well.

  So for me, in that sense, "all is metaphor" works, keeping in
  mind that being a metaphor does not make it "unreal" or
  "untouchable" or "unusable" or "invisible", rather, it
  acknowledges that our human understanding is completely linked
  to our perceptions of reality, and the better the metaphor, the
  more repeatable it becomes, making it something useful we can do
  stuff with.

  It's not that we "create reality"; we're not that amazing.

  But it's the map vs territory thing: we map the territory as we
  go along and can ONLY understand the Universe via the maps we
  use. They're forever linked together, both in ourselves and in
  the machines we create with those metaphors, like computers and
  such. Functional, useful, practical, physical. Still metaphors.
  Still useful.