Most of what I play requires a bass part that is reactive and melodic as opposed to repetitive. I find, however, that many of the lines I play will repeat themselves, just on a larger scale. So, instead of one bar that repeats, I will have 32 bars that repeat.
I can play the simple stuff, but it doesn't work within the idiom. It also doesn't bring me much joy. The only good thing I can say is that those sorts of parts give me a chance to muck about with my EQ when needed and meditate a little... I run a kaleidoscope on my iPad for just such an occasion.