I agree with Robert,
I have gotten sitewides from a few sites and when added up are in millions of pages and as afar as I can tell nothing bad happened. On the positive side my sites listed in a list of similar to mine sites but the fear was there.
My fist ever G penalty was a link from another of my sites to my main site: a CMS produced an infinite index.php?sddfghj and 10000+ were indexed by Google so I had 10,000+ links coming in as far as G was concerned. of course listening to 'experts' and desperate, I bought a PR9 link (yp, PR9!) among others to get out to get out and then I truly ef-ed myself :)
But links form others CAN HURT YOU. I am sure they have tests to determine intent but you can fall through the cracks. That's why my main site is always ready to pass manual inspection...after a few slight modifications just in case ;)
In this case though, they obviously got it right. See my above posts too.