What about having a "Go" button, but making it wider by setting its width via css? That obsoletes half of the article's suggestion. This leaves only one reason

What about having a "Go" button, but making it wider by setting its width via css? That obsoletes half of the article's suggestion. This leaves only one reason to have "Search" instead of "Go": saves you a label. This isn't a big deal IMO. Also, I'm not sure, but it's possible having a label is better, since it comes before the search bar instead of after. This might make it more obvious for users (but then again, maybe not; someone should run some A/B tests on this issue!)