I don't own a pressure cooker at this point. In principle I'm willing to be convinced, but I'm neither running into the sorts of problems it solves nor sure where I'd store it. I do stew-type soups (mostly bean stews and chilis) in the oven, simply because the oven is better at maintaining a constant low temperature. Pot roasts and baked beans, too, for the same reason.
The only chicken soup I make (and it's been a while since I've made it) is one that's a riff on a beer and onion soup recipe. The major logistical hurdle for that beer is that it requires one 12-oz. bottle of beer, and my wife and I are both beer nerds and we consume beer in twos. I suppose we could double the recipe, but that'd be a lot of soup.