"the weight added up to more than what I would need if I slept on the ground"
Yup. Staying toasty in cold weather in a hammock, for me, means carrying more weight in my pack. But, for me, it's completely worth it, as I sleep much, much better, and wake up much more refreshed, when sleeping in a hammock. And I mean, by far.
But that's me. We are all, of course, different.