While it is almost certain that I do not do judo properly, what I mean to say is that most aikido throws are done from a "natural" hanmi or posture while judo throws in my understanding require to bend the knees and stick the hip out to one side while the torso twists the other way (as in a classic ippon seoi nage for instance). At least for me this is not exactly as "natural" a position as the triangular aikido stance and straight upper body from which most throws are executed. But again I might be doing it wrong.
That doesn't really sound like a classic version of ippon seio nage. Elbows, shoulders, knees and toes are all pretty much in alignment if you're doing it right. I think there's just as much potential for correct/non-damaging movement in aikido and judo. Conversely, there's just as much room for horkin' and twisting, thus all the senior aikido folks who can't sit in seiza... Twisting and knees = sad knees.
Edit: linky goodness: http://www.judoinfo.com/video/gokyo/SeoiNage1.wmv