You just got to know how to use protoss. Sure, they are expenisive but they have advantages as well. The probes don't need to hang around to build stuff, they just leave them. While you're waiting for your 24+ zealots to spawn, you can build a crapload of pylons and mine minerals like a madman.
I can build about 8 gateways and 48 zealots in less than 10 minutes. All I do from there is the good ol' zealot/photon cannon rush into someone's base and boom! They're finished.
Unless you'd like to challenge me on bn, I suggest you reconsider.
Think about it...
Zergs can only use 3 slots at a time and to build another hatchery it requires 50 for the drone and an additional 300 for another hatchery which would take you a grand total of 5 minutes to build. And when you need militia for protection, you need to fill up more slots by spawning overlords. Creep colonies have two stages to undergo after a certain prerequisite, that's right, an evolution chamber and a 50mineral drone. Cheap, but time-consuming.