I have a blank ignore list (of course, I'm a mod!), and always have. Back when I wasn't a mod... I would simply ignore them without the list. Either adding them to the ignore list or just pretending they aren't there (like, ACT as if you had added them to the ignore list) works just as well -- one or the other, your choice. They both have pros and cons, so pick the one that works best for you.
Yeah, I have no one on my ignore list too, I try to make friends with everyone I can.