But it is in the eyes of a "normal" user who IMO sees Google as ultimately trustworthy. How many people rely on G. as their first port-of-call for emotional/health problems type searches every day? (things you'd only discuss with your partner/doctor). This extends to commercial searches too and users inherently trust that G. only gives them quality results. I would speculate that many people wouldn't be able to separate quality content and business reputation when it comes to rankings in search results. (ie "I found them on Google, so they *must* be legit").
Anyway, back to the main topic - SERPS for my important keywords seem to have remained stable, with only minor shuffling, but less important keywords are fluctuating from between obscurity and pages 2/3. The site has been online for approx. 5 years, but was only properly utilised and launched about 18 months ago. Traffic has been growing slowly, but steadily (might even be described as "organic"), with no sudden drops or sharp increases.
UK based (low traffic) service and eCommerce site.