Personally, I find the amount of sauce, dressing, or black pepper to be more a matter of preference and/or taste, rather that a standard ideal that is perfect for everyone. I sometimes get salad dressing on the size so I can control how much I get.
I knew a guy in college who put black pepper on almost everything. And not just a little, like literally at least 10 times what I might have put on. It's going in his mouth, so it's up to him.