It's a moot point for me now, but before I became a mod I never personally used the ignore feature nor felt any need to, and I'm sure I still wouldn't. That said, after reading through all the threads on this topic, I think the people who are opposed to 'who ignores me' have the strongest argument. It's simply reality that there are many people on here for whom the ignore feature has proved very beneficial (to them and others...me included) in keeping themselves from getting into thread-derailing squabbles with people they can't stand, or who from their POV always pick on friends they then feel they should defend, or who just in general agitate them so much that it poisons the social experience for them, even when they're not confrontational enough to come out and say so. And for many who do feel this way, the face-saving privacy of the ignore function--that you can spare yourself that friction without having to 'make a statement' over it--is a major part of its appeal. I'm seriously concerned that a lot of people for whom the ignore function helps keep their browsing here constructive and enjoyable will no longer feel comfortable using it if they know some of the people on their list will be able to see that they're on it. You may personally find that baffling or silly or 'weak', and fine, you're welcome to that opinion, but from my POV, if we're going to offer the ignore feature to begin with, it's a non-negotiable reality that keeping it wholly private will be critical to motivating some people to use it.
The only reasonably strong argument I've seen from the other end is that it 'clears some things up' to see who has you on ignore. I can understand that; while no one can put me on ignore, there are a couple people who I've stopped directly responding to, because it's pretty clear to me that they refuse to acknowledge my posts (not 'as a mod'--I'm talking ordinary discussions here) for some reason or another, and I can see where it might've been nice if it had been clear to me from the beginning that I was wasting my time trying to engage them. But really, no one ever has an obligation to respond to you anyway (unless you're a mod addressing them in that capacity)--they don't 'owe' you an explanation for nor an acknowledgment of that, and if they are deliberately ignoring you, it could just as easily be without the use of the ignore function. The notion that people might 'change their behavior' if they saw who had them on ignore doesn't strike me as likely at all. If you're the sort who regularly riles enough people to have accumulated a large 'who ignores me' list, chances are you don't give a crap anyway, and if it's a small one, A) you have no idea why they're ignoring you, it might be something benign and random, and B) what exactly would you do about it, anyhow? They can't see your posts after all, and contacting them privately, if that's even possible, is probably more likely to provoke defensiveness or evasiveness than anything else.
I just can't see the benefits of this outweighing the negatives.