I use it to save programmer time and to keep me from making really stupid errors.

Those times I don't use it with a hash or an array, I usually go back, add a new item on a new line, and have to debug the missing comma error. I'm pretty sure that's what the authors meant.

And the book from which I've learned the most besides the Camel is Object Oriented Perl. Even if you don't do a lot of OO Perl, there's bundles of good stuff in there.