I miss being able to rewind the film and do multiple exposures
I miss the intuitive manual operation of a simple SLR like my Minolta SRT-102. Match the needles, compensate over or under as instinct and experience dictated, press the shutter. Oh yeah, focus too. Then wind film, lather rinse, repeat. And for double exposures, you could re-cock the shutter without advancing the film.
The one thing that I really, really like with my DSLR is being able to adjust ISO at will. And a bunch of other things. Like the fact that I can shoot 1 frame or 100 frames for about the same price - nothing.
The good old days were okay, but the good new days aren't so bad either.