I think that the Yes/No/Cancel buttons are pretty confusing. I don't know why they are more confusing than other Yes/No/Cancel dialogs, but for me, they always have been.
I found a request to change the text on these buttons. It was filed towards the beginning of this year and immediately marked Do Not Fix. (This was http://www.intellij.net/tracker/idea/viewSCR?publicId=9893.)
Does anyone else find this confusing as well? I think this should be reopened, and I think it should have been marked Open for Discussion before it was marked Do Not Fix, at least, to see if it was confusing for other people.