For me at any rate.
I don't like to rush around at the last minute and my approved method of getting ready for a long holiday is to leave my bag open in a corner of the room and chuck stuff in that I will need. Once it starts to fill I then leave a list of stuff that is out standing, which I tick off as I go along.
It's going swimmingly and list is only showing the usual "cash, cards, keys, tickets, passports and wallet", plus a more involving item, "electronics". That always takes some effort to get together as we travel with two laptops, eReaders, hard drives and plenty more besides.