I think the seats that fired downwards would have worried me. I had a HS teacher who was Bomb/Nav in B-47's and said he nearly ejected himself on the ramp - downwards.
I recall reading of B-47 that had a problem, a fire warning I think, and the crew punched out, or tried to. The pilot and copilot's canopy came off, the control columns retracted into the floor, but the seats did not fire. The pilot climbed down under the instrument panel, saw that a crewman was unconscious on the floor, and bailed out through a lower hatch. The co-pilot started to do the same thing but when he saw the crewman out on the floor, climbed back up to his cockpit, pulled the control column up out of the floor and landed the airplane. Then he ran like hell, figuring that he had done enough to save the other guy's life and the airplane might blow up at any moment.
Imagine what it would be like climbing out of or back into that seat, which has not fired, and might go KERPOW at any second, with you halfway across it.