Mountain Mama was our server for one of our WCC breakfasts on our last trip. She's awesome!
Yes, the platter is priced per person "enjoying all they care to". It's a LOT of food, so bring your appetites! Oh, and don't forget that the milkshakes have unlimited refills too! And they have some funny spoofs if you ask for a lot of refills. I also quite enjoy what happens if you tell them your straw isn't long enough.
Beyond the usual gags, if you tell them you're in WDW celebrating something, they'll sometimes come up with things on the spot. Personal experience on the first night of my honeymoon: A coloring contest cooked up by Deputy Doug. I won. My prize? The indelible image of my newly-minted husband riding a hobby-horse around the restaurant singing/shouting "You are My Sunshine" (or at least the words he knew, which wasn't much). Good stuff!