It all depends on how you use it. If something I make produces an error, or unexpected output, the first thing I do after the usual "stop and think" phase is google it. More often than not, that search will give me at least half a page of Stackoverflow pages - many of them completely irrelevant to my specific problem of course - but looking at the code can jog something in my mind that I wouldn't have thought of myself. It helps to look at somewhat related code. At least in my opinion.