Well, among many more important reasons, one of the reasons I bought a TDI in the first place was bad experiences with oregon fuel attendants spilling on the side of my car when they thought my tank should take more (I guess habitually filling up at half is not very popular.)
However, since I pay in cash all the time, I'm at the mercy of the fueling station's preferences, and typically they want to pump it, which drives me bonkers.
But nobody's ever gotten upset at me for trying (although Jubitz in N portland has a sign saying customers must not even TOUCH the pumps). I've always understood state law to only include gasoline, not diesel, and usually when I ask they let me do it myself.
A handful of stations even have signs that require diesel self serve (though even at one of these such stations an attendant insisted he do it, because 'people don't like pumping their own diesel' Give me a break, seriously). Since I lived in washington for a while, I (like most US citizens) know how to pump my own freaking fuel.
There's plenty of warning signs, it has nothing to do with safety. It's just that the oregon state legislature thinks they are doing us peasants a favor by bossing us around. I hear it has been law since 1952. This means they've had 67 chances to repeal it, but only made a slight change recently for nonurban counties after 8PM.