Google’s head of search spam Matt Cutts announced in a recent video answer that Google receives about 5,000 reconsideration request per week through Google Webmaster Tools.
In January 2013, Google said it had taken manual action on 400,000 different websites and averaged about 5,000 reconsideration reports each week.
As you can imagine, that is a lot of reports for Googlers to review, and Google has told us they review each and every reconsideration request and respond to almost every one.
I suspect this is why Google launched the manual actions viewer recently. Now, the only way to submit a reconsideration request is to have a manual action in the manual action viewer. This should reduce the number of false reconsideration requests that Google needs to respond to.
Here is the video: