The people I know in real life who have embraced formula-style parenting have been more anxious as a rule. As in, almost all of them. I don't really know if it's MB-related...but then again, I don't apply as much weight to those classifications as some other people do
My real life friends who have been all about being formula parenting, a la Ezzo, all were needing something, someone to tell them what to do to get the results they desired. I think books like the ones Ezzo has written prey on that nervousness and anxiety. There is no guarantee that if you do X, Y, and Z the way someone has spelled out that you would get results A, B, and C. For people who tend towards anxiety, that's often a train wreck waiting to happen. Especially when the results you desire don't happen.