Then you haven't tried the right hammock. Bridge hammocks, Hennessy Hammocks, Warbonnet hammocks, and a handful of others will give you a flat sleeping surface.

Not that I am trying to convince anyone to try one - it's all about what works for you. It's just another misperception that you end up being banana shaped - you don't have to be a banana in a hammock, any more than you have to be cold on the ground. It's a matter of finding the right gear.