It is even more cool to float a dry over the top of holding slimers and get the aggressive ones to hit it.

While fishing the Stilly a few slimer seasons ago I had to switch to a floating line and a dry fly because there were so many humps you could not avoid snagging them with any other type of gear. I think I managed about 5 or 6 hits on a dry fly in about an hour. Landed a couple of them.