I don't think I've used it in the last decade or so.

I use it mainly out of habit more than anything else. I have a few random CGI scripts on my shared hosting for small personal utilities and it's just habit to start with #!/usr/bin/perl -wT even though I am the only person who will ever use them.

Probably used it ages ago for forms that were open to the entire Internet .. the forms I've used more recently are internal, so I get by with placeholders for anything that goes into the database. Recently .. nope.

Since everything I've done was for internal consumption only, and had no access to the Internet or write-access to any databases, there seemed to be no reason to use it.

I tend to start most NN-whatever.t with

#!perl -T
[download]

This is generally more out of habit than anything else. It occasionally finds some minor security hole that I can plug.