Yes, but I've found loads of them. And only on this server. I say spawnrate was kicked up.I believe its dokucraft high. For all of the texture packs (high, light, and dark) go to http://www.minecraftforum.net/topic/513093-19pre4-dokucraft-the-saga-continues-32x/
Also... aren't these supposed to be super rare?everyone is saying that they are seeing them a lot now, and I think you can create spider jockeys now if there is a skeleton in front of a spider and you shoot it at the right time to it can land on the spider.