Depending on your hammock and depending on your experience getting in and out of your hammock it shouldn't be that hard.

Getting into my mummy back in my hammock is easy... takes like 12 seconds. Getting into my fleece sleeping bag that I put inside my mummy bag in the winter is pretty dang annoying.

In the hammocks that don't have much room inside (claytor for example), a pad helps move widen the bottom of the hammock so you have more room to move around. This helps getting into the bag easier.