I would think that pre-drilling or not would be in direct relation to how wet the wood is. Since pressure treated wood is pretty darn soggy, I wouldn't think pre-drilling would be nessasary. Neither would cedar decking if it was sawn right off the log. But of course if the lumber is dry, then pre-drilling just might be required.
I have no intention of traveling from birth to the grave in a manicured and well preserved body; but rather I will skid in sideways, totally beat up, completely worn out, utterly exhausted and jump off my tractor and loudly yell, "Wow, this is what it took to feed a nation!"