One time for fun, I scanned some bracketed 135 shots into PS and merged them into an HDR image, like you would with a digital camera. It did not produce the same results. Sure, the increased dynamic range was there, but it multiplied the grain by 3! I might revisit that experiment one day when I'm looking for an unusual effect.
It's interesting to me that auto bracketing came out about the same time as matrix metering. It seems just as cameras started to actually meter light reliably, manufacturers taught us to quit trusting them. About the only time I could see myself using an auto bracketing feature enough to justify buying a new camera for it would be with IR film. And I don't suppose any of these auto bracketing cameras meter so well with an R72 filter attached, do they?