Certainly not a small group from the looks of things in this forum. It's just that more keep getting whacked as time goes on and the numbers affected just keep growing.
Personally, my sites got hit nearly a year ago and haven't recovered yet. Yahoo sends 10 visitors for every 1 that Google sends. Google is also being outdone by both MSN and ASK. I've given up on Google ever being a decent traffic source again. I'm just glad that other engines exist.
I'm rebuilding my sites from using CMS packages back to HTML with no databases and letting the chips fall where they may. I no longer give a hoot what Google does with them. I've had it with their idea of search results as I can't even find info myself that has nothing to do with any of my sites content.
Optirex, I sure hope you have better luck than I've had and that your sites recover quickly.
And, by the way, I will definitely be adding new content!