Without JD Drew, the Red Sox would have been in free-fall in the month of June. He batted in or scored 1/3 of their runs (and no, I didn't count the HR's twice in that, as some do). I spent last season fantacising about better, less-expensive right fielders that we could have gotten instead.
It is more exciting, and seems more important, to remember Jim Rice carrying the Sox for two weeks in Sept '86, or Yaz carrying them for two weeks in Sept '67. But they all count the same in the end, and sometimes a guy who can stop the bleeding is all you need.