Actually one drawback to use array references is apparent. You get parentheses-itis when trying to close your expression, because you cant just keep hitting close-parenthesis, but have to know when to hit the close-bracket instead.

Look at the calvalcade of closing characters in this single line

  # new style, more bracing, more types of bracing, harder to know wha
+t to close 

  { my $nest = $o->nest( 'PolicyCoverage', [CurrentlyInsured => Local:
+:Util::torf($L->{'insured'})]); 

  # old style - fewer levels of bracing, and fewer types of bracing
  { my $nest = $o->nest( 'PolicyCoverage',  CurrentlyInsured => Local:
+:Util::torf($L->{'insured'})) ;
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