I've seen a few posts from more experienced members either using or suggesting the use of the "ignore" button.
When merit system was kicked off, people created a lot of topics, complained a lot and begged for merit with low quality posts a lot. The user I knew who used Ignore button (at least the user publicly wrote it) is Jet Cash. 
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So, what I would really like is if next to "ignore" there was a less drastic option that only added them to my ignore list temporarily (say for 10 days), something like this:
I don't think it is necessary.- 10 days or 30 days are not long enough to change a user. It should be months.
- Forum unofficially has it. It does not completely exclude the ignored member from your view. You still can see the username and if you want, you can click on unignore anytime.