> OS X's UI is the last thing anyone would want if they
  > weren't used to it

I was very used to MS world, living in it (DOS and Windows, from 3.11 to XP) 1990-2006. I got my first iBook G4 in 2006 and never looked back to Win. In 2006-2007 I was using OS X, Win and Linux in parallel. I know pretty well why did I stick with OS X and it has nothing to do with being used to it.