A little bit of advice on this.
Yes it can help and can stop arguments, if it gets to the point where one poster just keeps, basically harassing another. Use the ignore to stop seeing any further responses before it gets too far.
Or you are tired of seeing the same thing repeated, as the OP said, you can just not go in the thread, or if you are already posted, then it starts.
However, at some point remove them from ignore. As many things are said in the "heat of the moment" as it does not mean that poster is always like that.
Also if you have someone on ignore. You do not see any threads they start. Even if you do not agree with them much of the time, you can miss out on some valuable news. Such as player signings or injuries. Also can lead to duplicate threads.
Say it has been posted by a person you have on ignore, so you see the news and create a thread. Only to find out there is already 3 pages about it.
So yes it can be a good feature, but remove them after things have cooled off.