I am a former Catholic in the process of becoming Orthodox, too.
It's interesting that before I began my conversion, I had the sense that many of the Orthodox converts in the U.S. were Catholics, but anecdotally, since I've begun meeting people in Seattle and Vancouver, most of the converts seem to have come from Protestantism. Of course, Protestants are the majority in the U.S. and Canada, especially out here in the WASPy (and increasingly secular) Pacific NW, but this has still surprised me. Ultimately, I think Catholics tend to be quite rooted people for whom religious faith is often wrapped up with family and ethnic identity moreso than it would be for Protestants.