Where is RECEIVE being used in existing systems?

Why should there be both LET-VALUES and RECEIVE?

I have written on books with narrower code margins
than anyone else (using let, letrec). I believe that
there is always a way to do what we need to do. When
the margins of an English paragraph don't work out,
we sometimes have to rewrite our sentences. And when
code margins don't work out, we have to rewrite code.

-- Matthias