What RK & salmonmac said. There are things that I block and things that I don't.
I tend to block projects more often than not. If its a gift for someone else, I always block it, even if it's just dish/washcloths. I don't block my own dishcloths, but just lay them out to dry.
I do block my superwash socks for drying as I can stand my sock blockers upside down in the groove of my washing machine. Even my superwas wool socks fuzz up a bit in the dryer. I hate fuzz of any sort in/on my socks. But that's me.