Where in the PNW? I still see them on trails north of King county in the suburbs. Not disagreeing with the message behind the original post but those slugs surprised me when I moved here from the Midwest and they're still around.
Western Washington. I used to go to a number of parks along the sound and see tons of slugs all the time. I know they aren't completely gone, but I can't even remember the last time I've seen one now.