These tires have been a huge upgrade over the factory Goodyear Wrangler SR-As. Now that was a highway tire (ie. high mileage generic style) while this is a street sport tire (low mileage high traction) so my traction on both wet and dry are vastly improved. What I've heard about going with wider tires usually applies to snow (like your analogy) but I don't plan on going anywhere near it down here in Florida, and will be cautious if I come across it. I don't get any "bump steer" or tramming from ruts or bumps like you mentioned either. The only effect I noticed was (and I was told about this before, so it may be psychosomatic) the percieved loss of torque- it seems to take a tick longer to get up to speed. But I can't really tell without having timed it before and after.
So I don't know if the width has anything effect performance wise, since it was a complete 180 on the design itself. But I'd do it again in a heartbeat, it looks great and has virtually no negatives, IMO.