I think "workaholics" are people who have remained in the busy trap so long that it's become their default mode of operation. It's a habit that can be tough to break.
Knowing that your inventory of defined work is complete and current you can give yourself permission to feel good about putting that stuff aside long enough to eat lunch.
No matter how long the lists are make sure that you continue to update and review them regularly. That will give your mind the freedom to let go enough for you to put it aside and go do something else.
"You can only feel good about what you're not doing when you know what you're not doing." -DA