Have I ever used quotation marks for emphasis? Nathan Bransford says it absolutely is not done. He also says it's an error committed by "people of a certain age." (I am not quoting him there. I am using quotation marks to either show irony or euphemism. I'm not sure which, but it doesn't matter because Bransford says both are acceptable.)
Being older than dirt, myself, I fear I have used them for emphasis--but not since technology provided me with italics!
The "Blog" of "unnecessary" quotation marks should help us all remember to curb our quotation mark usage.