They've already threatened to make it user-friendly. I highly doubt that you'll have to do each individual building. Unless the "building" is more like a "district" and you have one supermassive apartment block for the entire city, in which case doing it individual would be fine.
Something tells me the AI will be designing buildings if you let it, though. Like if you give it a free plot and a building type, then it will throw together something rational and low-efficiency.