Man, if I was travelling to a different country and needed a passport AND forgot my passport, then I would agree with you. I guess my life is not so hectic that I don't forget the absolute necessities (you can't fly without that or you can die without that).
My life is not that hectic and I often travel to other countries, yet I have forgotten my passport once and only once. Part of me thinks that once it happens it's very unlikely to happen again.
I still don't use a checklist for traveling, but I do use a to-do list religiously for...actual things to do. After this thread, I may just add a few more lists.