I definitely don't miss being bloated and gassy! That is a disgusting feeling.
I don't miss being disappointed when trying on clothes or being embarrassed to ask the sales person for a larger size. (I went shopping at Banana Republic before I started IP and wanted to cry because the largest size (14's) in the Petite section were too tight. I knew then that I had to do something!)
I don't miss spending a lot of my extra money on eating out. It's nice to look at my credit card statement and not seeing restaurant after restaurant listed on it. We still eat out at a steak house here and there for a treat but maybe once a week tops. Those charges have been replaced with IP product but that is temporary.