Banzai Run is a favorite of mine. I like how this ramp crosses over the entire back of the playfield. The accompanied light show is a piece of pinball perfection.
They don't count as a single shot, but I would also like to mention the ramps and divertors on The Shadow. Very fun to shoot combo's on and still a unique feature after 23+ years. The sound of a ball hitting the metal of these ramps is very unique and instantly recognizable.