No, not really. I'm overweight so I wish I would get magically smaller in session.
The closest I experience to getting small in therapy is when T stands up and looms over me (he's really tall). It makes me feel really good to stand next to him when he is so big, like he is my protector or something. Plus, I like it because my husband is about my height and I am not used to having a male in my life who towers over me. I think I have kind of a primal reaction to it.
Otherwise, my T tries to be at my level. He has told me before he doesn't have all the answers, that there are lots of better therapists than he (ha!!!), and that he doesn't want me to put him up on a pedestal, that he's a normal person, just like me.