When I stay at Pop or POR, I always request and hope to get a non-connecting room. There is definitely a difference in how much you can hear through those doors as opposed to a non-connecting room. The door is right by the beds.
When I stay in a DVC studio at Kidani Village, Bay Lake Tower, or the Polynesian, there has always been a connecting door, but I don't mind that as much at all. The connecting doors in those studios are near the door entrance. So I think most of what you may hear, depending on your neighbors, is in the area of the kitchenette, bathrooms, closet, etc. rather than where you sleep and relax.
Love the studios! Have fun!