Sheesh. I didn't say it was easy, I only stated what works and was most efficient for me. It's easier and safer than trying to modify someone's code without comments, strict, or knowing what the changes might affect.
Most developers here use modules and break up functionality decently even if they don't use strict. It makes sense. Break up large code into modules for easier testing, updates, and re-use. No, there's no need to rewrite it. And yes, adopting a system means using existing or writing test suites. Of course, the two printers next to my cube don't make it very quiet.