I was doing my usual trawl through the Flagged Posts page, and finally got annoyed enough about this 'feature' to raise a question about it. This close vote confirmation/information tooltip is what annoys me:
The problem: I don't need it.
Why? I really don't care what it has to say.
Let me explain why this feature makes an annoying UX for me
Once I have cast my vote, I move on to the next flagged question. I have a great interest in keeping SO clean and tidy, but I have almost zero interest in the specific question I just voted on. I can also add up to five without any help - if a question already has two close votes, then I cast mine, I know that it will require two more - basic arithmetic, I don't need to be told1. If it collects enough votes to be closed then fantastico!! If it doesn't, then que será, será, so be it2. If someone else added a close vote at the same time as me, I still don't really care.
Now add to that the fact that I am voting on numerous questions. When the tooltip pops up, it obscures part of the title of the next entry, and I have to make an extra click to get rid of it immediately.
Maybe that tooltip is useful the first 5 times you see it, but it certainly isn't when you've seen it for the 1000th time.
1 If you want to make it interesting, change the base of the number shown. Just to be different, make it base 3.
2 Apologies to any Spanish speakers for this butchering of your language - blame Hollywood.