Oh man I can't tell you how many times it has helped me.
I am forgetful and with anywhere from 8-30 snakes to feed this year I totally relied on the records. I couldn't remember who if anyone had skipped, who I was feeding this week (my males only eat twice per month) or anything. the records let me look back.
Also my male cal king stopped eating for three months this year, it was easy to look back to last year and see its around the same time as before, so most likely just his norm.