Yeah, I'm familiar with Church history (though I'd assume less so than you). From what I understand, there are two major philosophical trends within it, the original Platonic approach and then the Aristotelianism that eventually got introduced into the West through the Muslims and became the foundations of Scholasticism. Of course, the Muslims didn't just "discover" Aristotle--they got all those writings from the Byzantines, so it's not really like the West had something that the East didn't. Though I suppose the fact that all this stuff was "new" to Catholicism in a way it never was for Orthodoxy meant that it needed to be theologically integrated to not pose a threat.
Sometimes I wonder how much it is just a matter of personalities, though. What would Catholicism be without Augustine or Aquinas? Something very different than it actually is. I'm not sure if Orthodoxy can point to the influence of very specific saints in the same way (not including Paul, of course). Maybe Gregory Palamas? I've seen him pointed to as the theologian who saved Orthodoxy from Scholasticism before, though I'm not sure precisely how.
But yeah, I think Protestantism is strongly defined in contrast with Catholicism. Either they drop the mysteries entirely and try to intellectualize everything, à la Calvinism, or they go the opposite route and oppose faith and reason--some of those Lutheran theologians certainly do that. Or they do one of a million others things because you can't really pin down Protestantism very well at all.
Anyway, no worries about tangents. I always like reading what you have to say.