Hammock camping is a very personal decision. Personally, I tried it for a while and just found it to be a hassle, and I never managed to find a comfortable sleep position.

But the hammock campers I do know recommend getting an underquilt instead of using a sleeping pad. Of course, this can fuck you over if you can't find any trees - but the underquilt isn't weirdly square in the hammock, and instead just conforms to the hammock's shape.