I agree having to use print with a newline instead of say is not a good reason to upgrade ...
yet I'm struggling to understand your seemingly blase attitude towards Security.
(Oh, and I strongly agree that chromatic's Perl (and agile dev) books are awesome! ;-).
I suspect you come from a different (smaller?) commercial environment than me. Do you have Security auditors?
We do, they use tools (luckily mostly Windows-only for now) and they have the ear of upper management.
If you're using a version of Perl open to security exploits (see perlsec ... DoS attacks based on Perl hash algorithmic complexity
spring to mind) or any product (including Perl) that is out of official support, they'd be all over you like hair on soap.
They don't have the time to understand all the nuances of every product running on every computer so they tend to heavily rely on tools
and enforce blanket rules, such as "you are not allowed to use a product that is out of support" or
"you must regularly check for exploits and patch your software promptly".