quotes on a single word actually _are_ the equivalent of +, AFAIK. I.e if you want foo, bar, quox to be all present on the page you search, the term is <"foo" "bar" "quox"> (minus angle brackets, obviously)
The statistic is over the total number of users, not over the total number of human beings, or the total number of human beings that ever existed, or the number of atoms in the universe.
It's good to see a Google manager hold that point of view. Do you have any influence in the organization? Or are mchurch's nightmare demons really running the show?
I've worked on the query parsing code for google.com, and, I promise you, + and "" were equivalent. (Barring unusual edge cases with ambiguous combinations of punctuation.)