On my third or fourth cruise I was so concerned with all the "stuff" that I needed that I forgot our travel wallet with the passports, cruise docs, and airline information inside. It was on the kitchen table. Luckily we were only a few minutes away from home when I remembered.
Don't get too wrapped up in the non-essentials and forget the most important stuff.
Remember, that in almost all instances, if you forget something you can buy it.