In reply to Kemics:
I could be wrong but on the whole I don't think it's really any slower to dry than, say, Stanage.
Perhaps the trees are just far enough back from the rock, or maybe there's more to it than trees, I'm not sure. Gardoms certainly holds on to the damp a lot longer, but Rivelin and Wharncliffe are both shrouded in trees too and dry reasonably quickly.
If ever you're in the area when it's really blowing a hoolie from the West, that can be a good time to check out a bit of esoterica and visit Turningstone Edge. It faces East and has a thick tangle of rhododendrons all along the top (also bottom, middle..)