From my many rides (7 solo trips), they've never made me share a row, ride car, anything, with another person. Once at IASW, I really felt bad because they squeezed a family of 4 into the front, narrower, row on a boat, then gave me the entire second row to myself. I sometimes wonder if they do that because, in this day and age, if they put me with a person whom I later claim tried something, maybe they're afraid I'd sue Disney (I really don't know the reason, just guessing).