I figure we oughta have perspective from the other side of the spectrum. I'm 6'4, and right about 205 lbs. While this can definitely come in handy for the large dogs that are unruly, I have an terrible time with any of the small or toy breeds. I don't know how any of you hold pets, but we have a sort of "choke hold", where the dogs neck goes in the crook of your elbow, and the other arm wraps around their trunk. With small dogs, my crook is so large, that they can easily jump about, scratch my arm to pits, and in general be moving around too much for an exam (should they not be well behaved).
So even if being large does have its advantage, I definitely have to switch out with a smaller tech if a small dog is acting up.