I think more specifically, non commercial, and no public services.
Sure, you can torrent a terabyte of movies, but don't open up a website offering terabytes of movies to everyone.
What about a linux pc running an apache/web and openarena/game servers serving personal photos to friends and family? How about a custom carpenter showing off his work for potential customers to see and a phone number to call to arrange payment and shipment? Where exactly do you draw that line? Network Neutrality is about the idea that the network operator doesn't get to draw that line. They have to treat traffic as traffic. It doesn't matter whether it was a carpenter's server eating up traffic, or a chronic lol-cat youtube uploader. They have to deal with such congestion in ways that do not give preference to any lawful application, service, or device. Otherwise it won't be long till only Google branded, or Google certified devices are allowed to be used with your Google connection (bit of an exageration, the actual road forward will be subtler, but with as much as they can get away with that helps drive up their overall profits).