In addition to some of the other things people already posted,
I'm looking forward too:
-not having to move the car seat back every time i get in and out of the car or making those heavy/ out of breath breathing noises when trying to adjust myself into the seat.
- not having that look of embarrassment when you need to slide in between someone's chair and the wall, and the gap looks big (and 2 other people just fit through there with no problem), but you know you need a little extra room