I'll just add in my two cents: If you want proof that we are getting indexed and that our Google ranking isn't artificially low, check out some other queries, such as:
Where we don't rank as high is with the ridiculously common/popular questions, which definitely includes the difference between white and brown eggs. Another instance of this is our question about how to chop onions without crying or how to peel garlic - they're quite popular on our site, but they're so popular in general that we just get buried under the pile-on. There's just no way we're going to be able to compete with sites like YouTube, chow.com, or Lifehacker, considering their traffic.
No site is immune to this. Even one of Stack Overflow's most highly-trafficked questions ever, How can I prevent SQL injection?, ranks #2 for that exact phrase, and #4 for "preventing sql injection". The gap is less marked because Stack Overflow has over 100 times our traffic, but it proves that you can't just "SEO" your way to the top of every query. The internet is a big place.
But that doesn't matter. The whole idea of Stack Exchange is to cover the "long tail" of questions - to make it easy to find quality answers to questions that are normally hard to find. If the question is already answered comprehensively in 46,000 other places, it's not our mandate to compete.
FWIW, I suspect (can't prove) that part of the reason we rank fairly consistently above sites like wikihow is that Google recognizes them as content farms and penalizes them.
Moderators have access to Google analytics and while we can't share the specifics, I can tell you that our search engine traffic is very high and dwarfs all other forms of traffic - just like every other Stack Exchange site including Stack Overflow.