Using map in void context is a popular topic on Perlmonks, somewhat of a religious war à la Emacs and vi. Some previous discussion of the topic includes is the use of map in a void context deprecated ? (42 comments). Remember also that Perl 5.8.1 contained an optimization for map in a void context. I believe the conclusion reached was that "we agree to disagree", in the sense that both sides agree not to impose their beliefs on the other side. Recall also Larry's quote on the matter:

The argument against using an operator for other than its primary purpose strikes me the same as the old argument that you shouldn't have sex for other than procreational purposes. Sometimes side effects are more enjoyable than the originally intended effect.