I'm mostly with jethro. The boiler plate I use is:

use strict;
use warnings;
[download]

In some environments, I use either 'use 5.010;' or 'use 5.006;' as well. But even if they are in my boilerplate, they're likely candidates to be subject to chance.

I've experimented with larger boilerplates. But then I found myself more often than not deleting lines.