I think Exporter::Lite complained about how use strict slowed down the compile. Of course, it's a tiny module -- for pretty much anything non-tiny, the overhead added by strict is negligible.
# Using strict or vars almost doubles our load time. Turn them back
# on when debugging.
#use strict 'vars'; # we're going to be doing a lot of sym refs
#use vars qw($VERSION @EXPORT);
(My) Bottom line, I always turn them on when I start a script, and for the last 8 years or more never even think about turning them off, except for very small scopes.
I often forget to turn them on for a brand-new script and then wonder why my script is not working =(