I have two clipboards with my checklists printed out. If it's on my computer as a digital document tucked away in a directory/folder somewhere, it tends to get lost in the digital ether.
I grab my clipboard to see if I have a checklist. If I lose the checklist page, I print another one out. No biggie. Having that clipboard on my desk has saved me time. If I don't see in my clipboard, I probably don't have a checklist made and I'll need to add that to my "systems maintenance" project.
Like
@thomasbk said, it helps to review and update them. There are many times I would skip a step because I didn't really need a step that I thought was important. Or that step might just be in the wrong checklist.