I stopped using any ice spells in my aoe rotation since the patch. Not because of any nerfs or long cast times/manual aiming, but because there is no good reason to be in Umbral Ice 3 anymore without the double dipping mechanic. I wouldn't use blizzard 2 anymore even if it wasn't nerfed. I use fire 3 > fire 2 > flare > transpose > repeat. Flare is the goal in aoe rotations and if I can't double dip into it then I see no need to have full mana or waste time with ice spells to get into UI3. Those 3 spells take up the majority of the transpose cool down, which this rotation hinges upon.
So for me at least, the blizzard 2 nerf itself and the freeze buff are irrelevant to my aoe rotation. Fixing the double dip bug just gave me no reason to need them.