I’ve been on and off index cards for years. I use them for a while and then I stop. Usually because I run out and don’t get to buying more of them.
I think they are great for some things, and not so great for others. They are awesome for capturing singular items, and making short todo lists. But I don’t like them once you have stacks of connected cards.
It has been in the back of my mind for a while now to test out using index cards for my hit-list. First and foremost because they are so easy to carry and use in a way where you never have to transfer things over or carry half complete lists.