Speaking from the after standpoint...
I don't miss being so out of breath I can't do simple tasks.
I don't miss being sick all the time.
I don't miss being too tired after work to do anything but sit and sleep.
I don't miss getting frustrated trying to find clothes that fit right and look good.
I don't miss hating shopping because of having to stand on my feet so long at the checkout and trying to weave my fat butt through narrow aisles full of shoppers.
I don't miss being uncomfortable in small carseats, plane seats, chairs, etc.
I don't miss my back aches and knee aches.
I don't miss looking in the mirror and thinking "ugghhhh."
I don't miss missing out on life because I was always just too tired to get out and do anything.
I frankly just don't miss anything from then.