I always add a shebang line but I often use the perl script args to execute scripts. In particular, it is useful to test a script with multiple versions of perl or different installations¹.

I work on a variety of machines, some with multiple installations (usually one for general use and occasionally another for something specialized) and I keep a personal installation in my NFS'd home directory.

-sauoq
"My two cents aren't worth a dime.";