I was referring to FindBin itself, which uses the same libs as the snippet (File::Spec, and File::Basename), and brings in Cwd, Carp, and Config as well. It's not much more (and most likely already loaded by other things anyway) but uneeded in this particular case. :)
Whichever's easier for you. Either way works fine (at least I think it does.. haven't extensively tested every scenario), and comes in handy.