In my holy/honest/humble opinion. A rephrasing of imo. Used in net-speak (read: retarded), it's mainly used to attempt to show that the opinion stated was either godly, true, or was stated by someone with humility. All three of those reasons are what would be simply known as bullshit. Retard1: omg imho, ur a fag lol.
CoolSculpting is quite different to Cryosurgery, which uses cold to kill off tissue, such as tumors. Typically cryosurgery uses far lower temperatures (-20c/-4f to -40c/-40f) and immediately kills off the living cells (necrosis) .
Answer Wiki. I'll only address one of the procedures you asked: CoolSculpting. It is safe in that it has been cleared by the FDA on September 2010. However, it is not a means to lose weight. As the name suggests, CoolSculpting is a body sculpting procedure meant to reduce about 20-25% of fat layers.