Senkos by far are my favorite dead stick bait. Cast it out and sit there, I've caught fish while eating a sandwich, lost the sandwich a few times too. I've let them sit as long as five grueling minutes, but my friends dad loves to throw it out and wait like bait fishing.
I've dead sticked suspending jerk baits as well. Pretty effective in cold clear water. Cast it out, get it to the right depth, give it a jerk and watch the line for a bump. My favored time to use this is actually in current channels with structure. Cast out, get it to depth and then free spool. The drag on the line will give it a little wiggle, but the current will take it right past the ambush points, fish would grab it and run.