I'm not a big fan of plastic surgery either. I think having your face cut open is disgusting and kind of sad. I think liposuction is kind of an easy way out. If you really want to be thinner, exercise and eat right. I don't enjoy exercise, but I do it because I want to be in shape and look good.
The boob job is a little different, imo because it is so directly linked to self-esteem and confidence. I say this as someone who's mother and two sisters all had them done. None of them have anything more than a C cup. They all had misquito bites naturally though, and my parents paid for both my sisters to have this done at like 16 or 17 years old. You would never guess they'd had the procedure, because their chests are in perfect proportion with their bodies now. There's the other side of that equation for girls who have way too much and need a reduction for health and comfort concerns.