The number of camp sites when you use a tent or tarp are limited to the places where you have flat ground, no pooling of water, no runoff flowing through, clear of brush, clear of rocks and roots, and many other little things to make your sleep enjoyable as well as just supporting the structure. Many times you must either crowd into a limited number of spots with others, go to designated sites, create a site (increasing impact), or take a less than perfect site. With a hammock, it's almost all good.
In the Desert Southwest, where trees only grow at the highest elevations and along perennial water sources, hammocks would be most challenged. Some hammocks have been designed to be pitched on the ground, and I have seen some creative rigging systems, but these approaches have significant trade-offs and seem forced. I’ll just bring my modular tent or tarp & bivy, thanks.
There was a wide variation in weight between the heaviest and lightest setups we tested. Our score for the weight metric takes into account the hammocks themselves and anything attached to them (such as carabiners), and a stuff sack (if included). Suspension systems, such as tree straps, were not included in the measured package weight unless the manufacturer specifically included them in the same stuff sack. Many of the models we tested did not come with a suspension system, and the weight of your final setup is therefore contingent on the system you choose to implement.

First time hammock campers often hang their hammock with little slack thinking this will be more comfortable. However, hanging it loose with slack in the middle actually makes the hammock easier to sit and lay in (more on laying in your hammock below). You should also aim to keep the hammock lower to the ground. A low hung hammock is better because you can reach your belongings on the ground without getting up and if you accidentally fall out of the hammock you won't get hurt. 
Back in my tent days I remember going through a similar routine every summer: I’d wake up in the morning and feel like I needed to get up and out of the tent as quickly as possible even if I was still tired.  The sun would quickly be turning my tent into a sauna and I’d find myself moving into a camping chair by the fire pit, waiting for other people to wake up and go through the same process so we could all sit around and talk about what rock or root had kept us up during the night (or marvel at the one person in the group who slept great and seemed to possess an almost superhuman ability to sleep through, and on, anything).