Oh! I so miss those days
I breastfed for about 16 months also. He really didn't need me after 13 but neither of us were quite ready to leave go .... He's 12 now!
I was an exception to the rule as to I actually gained quite a bit while I was breastfeeding. If I attempted to watch my diet, my milk would go down. Once I weaned him and started eating properly again, yes, the weight came off pretty easy (until the 15 lbs mark, then it was slow as usual.)
Off the weight subject - all of sudden he started reaching down my shirt for comfort. LOL I was so used to him around "them" that I didn't even really notice until a few people in public pointed out that my child was holding my booby.
He was also a little more clingy that usual but got over that within a few months.
Good luck and if you ever miss it or get sad, just remember ...
"Our jobs as parents is to make them not need us at all after 18 .... " Sad but true