We also plate from the stove or counter. Actually, whatever meat & veggie I make will be on the stove and since I make my mashed potatoes in the kitchen aid mixer, I serve them from that. If anyone wants seconds, the just get up, go to the stove and get some more.
I will plate other's plates ONCE IN A WHILE. It's only when I'm already standing at the stove with serving spoon in hand. They'll come up to the stove with their plate (fully ready to serve themselves, mind you) and I might just take their plate and give them a scoop or two, whatever they want. But normally, I'll grab my plate, get my food and sit. Then they'll follow suit.
And just like others, I will serve from platters/bowls/etc on the table for company or a holiday.