It really depends on the hospital. If you do peds anesthesia at a big childrens hospital then you'll see peds all day. If it's scheduled to be peds anesthesia at a small place or one with an integrated childrens hospital, it's not uncommon for the attendings to work adult cases at least some of the time. A good deal of peds work is also off-site as kids need to hold still for a lot of imaging procedures and biopsies. You'll definately get your feet wet in peds anesthesia, as to whether it represents residency again depends on the program largely. You'll most likely see residents doing peds rotations though, and possibly fellows too. The pathology in kids is different and I think I had to read a lot more to understand what was going on. Take peds hearts for example, there's a lot of reading to do on what the lesions are and what the procedure is. I found that I got less procedures overall compared with adult. The attendings were less receptive to letting me try central lines and a-lines in kids. I did get plenty of peripheral IV practice though! And these are not easy to get in little ones.
I would say definately enjoy your peds rotation. It was rewarding to me and is one of the more scary fields within anesthesia, just because kids can go bad quick. When you on away rotations though, they generally expect that you know basically nothing. So any knowledge you picked up is just a bonus. If you want to impress them, it's more about attitude than how good you are at intubating and putting lines in. Anyone can learn that stuff, you just have to show that you're teachable and willing to try.