Here’s an unsung name of pick-playing bassist: Helmut Hattler.
Founder of the German krautrock-turned-fusion band, Kraan, Hattler made a name for himself, in Germany especially, playing with a pick. When I think of pick-players, the first name that springs to mind is Chris Squire of the band Yes, the next name is Hattler.
Here is Kraan’s tune Vollgas Ahoi (featuring some wonderfully weird mime artists):
For more on Hattler, check out his official web site.