I've used plenty of knowledge found on SO but I've never done a direct copy/paste. I also find it kind of weird how "normal" copy/pasting from SO seems to be. It's always paid off better in my experience to take the extra minute to understand the code I would have otherwise copy/pasted, and then implement what I need from it myself. The time savings from copy/pasting seem to average back out later as technical debt when something inevitably has to be fixed or changed.