I never shake my soy milk.
I voted as a milk drinker, but probably just screwed up the stats of your poll a bit.
"Does soy have titties??? NO!! And keep it away from my moo-cow-****-milk.
I use the plastic bags, so I don't shake, and I use it up far too fast in 4-liter sacks to worry about it going bad.
But if I'm out and about, and there is a waxboard container, I will pinch the spout, and give it a shake. An affection in tribute to my younger days.