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Reading fine print or other detailed tasks that require good visibility would be difficult or impossible in the dark. Operating machinery or driving safely also requires adequate lighting to see and navigate properly.
It would be impossible for humans to land on Jupiter, Saturn or Uranus. As a group, these planets are referred to as "gas giants". If any of them has a solid surface at all, it lies beneath thousands of miles of gas or liquid, in total dark and under temendous pressure.
Dark
Not unless you have a definition of "completely dark" that means something other than completely dark (i.e. no light whatsoever).
One significant effect would be that long range radio communication by shortwave would be impossible.
If the earth did not mood it would always be dark. It would also be cold.