@Serpico - that's what choke points are for. Even without warpgates early Zerg can't do crap all with just zerglings
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I am fully aware of this, that's why zergling rushes generally don't work against Protoss. That said, reversing them and forcing them to regroup is much faster with warpgates. Otherwise you are slowly replenishing forces as a steady stream of lings keep rolling in. Getting a bunch of stalkers/zealots out the door immediately and at once versus waiting for them isn't necessarily a bad thing.
In any case, extending the build time for warpgates was obviously done to kill PvP warpgate rushes. Not that it will change things all that much, standard 2 or 3 gate rushes are still extremely effective in PvP.