You can turn into a bird, an ant, an elephant, a snake, a goddamn tardigrade, anything! That's what I would want.
Imagine you miss a bus or something, oh, too bad, I CAN FLY! *shift into an eagle* You could turn into an ant and explore the world in a different perspective! Even turn into a rat and join a rat colony in your house, and then kill them from the inside!
Right now I am making a Fallout map (if you know fallout, you may know why it takes so long), and so far it has taken me two months, without world-edit (Didn't work, too lazy) and mostly alone. Other maps can take me only a week though. It always depends on the size/quality.