In my experience, MAX DEEPS is your first line of survivability. PoE can be incredibly brutal and take you from 7k ehp to 0 in half a second. The best way to avoid death is to kill the enemies before they get a chance to attack.
The more things change the more they stay the same. So PoE hasnt really changed that much: 7k ehp hits , even as a random example, is relatively moderate. There used to be >10k hp Kaom's Heart builds running around in parallel with >15k ES LL builds. All those numbers were before taking into account other defences which boosted EHP-s to even more absurd hights. Even then there were still extreme instances in which nasty Magic/Rare mobs+ map mod combos atomized these walking tanks be merely sneezing on them.
So far it seems really all that has changed is even bigger dps numbers.
EDIT: Minions still viable? Last time I was around golems were the hot shit.