Ice PvP is different, it adds a variety to MCSG, a fun variety at that.
If you like not being able to hit anyone ever....
Also, the reason Demon's Breeze is a good map is because it was unique. It took the base of Breeze Island and (imo) made something even better! The lava made for a unique play style and some hilarious deaths, and the builds and chest placement was phenomenal. Freeze Island in my humble opinion looks bad. It looks like they did //set water ice and //set sand snow and build a few dragons and thought it was good. While I have nothing against the map-makers, the map itself isn't really appealing to the eye, and doesn't play very well.
[EDIT]:
lets face it, Freeze is better than some new maps recently added.
Really? I mean sure Vida Cova wasn't that good, but I'd rather play Vida Cova
and Boombeard's Battle over Freeze Island! And why all the hate on the new maps? A lot of them are better than older ones!