From my experience in SEO, and my experience in logic. The Google’s spider eyes are getting closer to the real human eyes. It means that Google is getting better in looking at the websites, just like we do, in an automatic way.
You can fool Google in the short-term, but you just can’t beat it in the long-run. Google is adding more and more algorithms to improve the way they rank the websites, which makes it harder for the SEO guys.
So my advice to you, is to put your human visitor before the spider one. In other words, pay more attention to improving your visitors experience,
