I find myself using the third pass to catch those irritating little quirks, like using the same adjective twice in a paragraph. I do find myself fussing more over things I publish online, because anything I submit to a publisher, if accepted, is going to be reviewed by an editor. The editor will place my nose firmly to the grindstone, and make me fix what I missed.
The advantage of that, however, is that I can be taught, and I try not to make those mistakes again.