It's true, black pepper is usually used sparingly in Western dishes, but not always. I've enjoyed foods that had so much black pepper on them that it was practically a breading....black pepper crusted tuna, black pepper crusted steak, black pepper crusted pork tenderloin. I don't think they're particularly spicy; the dominant flavor I get is floral, maybe herbal.
I'm not a chef or food scientist or anything like that, but I think the "hot" chemicals in black pepper must break down when cooked, leaving behind the more subtle flavors. So black pepper is usually added sparingly to a raw salad, but can be added more generously to raw foods before cooking. I'm not sure, this is just what I've observed from cooking. It's equally possible that I just have a high spice tolerance.