Why? Too much typing? Are the programs you write that short for these two statements to make up a significant amount of verbiage?

But well...

1. use a template
2. if you use vim, stick these lines into your .vimrc:

   map <C-P> i#!/usr/bin/perl<CR>use strict;<CR>use warnings;<CR><CR>
   ab usw use strict;<CR>use warnings
   [download]

   and insert the #!-line and those uses with <Ctrl>-P in command mode or typing usw; in insert mode
3. write something similar for emacs
4. let others write your program headers...
5. what moritz sayeth