Rich-
I do it all...and I really do not care how one fishes as long as they exhibit good ethics for the fish, the river and their fellow fishermen.

For me, it all depends on my mood and the water that I am fishing.

Some water just is not condusive to swinging a fly yet it holds fish...lots of fish so I will utilize probally the ultimate chuck 'n' duck method and yet other water is not effectively fished in that manner...which is most.

Plus, I usually have brought enough fish to hand by the middle of July employing chuck'n'duck methods that I spend the rest of the summer and fall chasing after fish with the floating line and traditional methods.

Catch rates may go down but I still do well enough to keep my urges in check...

Same idea in the winter as well...just whatever mood I am in and whatever method is most condusive to the water that I am fishing.