One of the pages I rewrote has had its Google rankings return. The traffic is actually higher now than PrePanda. The site as a whole is still down from before Panda but started inching back a little bit today. I don't know if it will stay that way, but I guess it is better than seeing further drops.
I should add that I didn't just rewrite the page but I cleaned up a lot of stuff on the site as a whole and got rid of all the thin pages.