My number one rule of packing has always been "They have a Walmart there." Applies most places anyway.
But the big benefit of a checklist is you don't have surprises like finding out you forgot the corkscrew when sitting down for a glass of wine while watching the sunset or that you never got the camp chairs repacked after you used them for the graduation party.
I print my checklist and then circle anything I'm not sure is already packed. Then I use the back as a menu guide so I can see what I might want to pack from home, like catsup or barbecue sauce. Then I make a shopping list and a to do list along the sides of the page.
Makes packing fast, makes shopping fast, and I don't spend two days worrying about what I'm forgetting!
