First thing, really, is these aren't so much nerfs for Zerg, as the 16 patch was buffs
Still, early game for Zerg is damn hard, but if they can make it unmolested past the 6 minute mark they are usually golden.
For me, it's good the Zealot timings have been reduced. It was damn hard on Steppes of War if a zerg 6-8 pooled you and you did ANYTHING other than 10 gated and had probes keyed up to block the ramp.
I lost about 6 games yesterday to variations of the 'ling rush. And I knew it was coming, I just wasn't able to get enough zealots out to fend it off.
They can have like 12 lings while you only have 2 zealots and with decent micro from the zerg, there's little to be done.
On bigger maps it's not such an issue. But it broke steppes PVZ.
The bunker thing is a bit mental. The reaper change is okay, early reapers weren't to big of a problem even on steppes. With the nerf they got in patch 16, they were basically only good for delayed scouting.