Type Much?

I disagree with this piece.  I really do.  Yes, really.  It argues that putting two spaces after a period is wrong.  I disagree.  It is hard enough to read student papers, for instance, when they no longer use commas, but not having sentences that clearly end.  And a new one begins.  But if we only use one space, then the sentences will seem to run together. Right. So, let me ask my readers: do you prefer one space? Or two?  I will not change, but I will know whether I should feel shame.  Or not.