I don't want to know who built this villager breeder on the creative server, but in the future you need to be more careful. I was building when I changed my render distance and my frame rate dropped to 0/1 for about an hour and a half while I was trying to kill the 1200+ villagers that were spawning in this system. I destroyed the machine.
If you want to test infinite systems on the creative server, I don't have a problem with it. Just make sure they are totally and completely disabled before leaving them.