Saying the drone is taking the photo is like saying that if you use the self-timer on your camera the camera took the photo not you. Sure you're not there hitting a physical shutter button on the drone, but you still have to get it where you want, point it where you want, pretty much all the same compositional tricks you would on the ground, just remotely. And you still have to get the exposure right, even more so since most have smaller sensors and thus less latitude in post to fix exposure errors! As good as they are, auto still does not work well on drones and most good drone shots you see were shot with manual exposure.
That said, with drones still being kind of new and novel it's a lot easier to get a "good" photo. You can sort of just throw it up there, point it anywhere, and the shot will look cool just because it's a new perspective we're not used to seeing. But as we get more used to seeing aerial photos, just as much thought will need to be put into composition as done on the ground. And we're already getting there, 10 years ago you could throw a drone in the air, point it down at trees, and everyone would be completely amazed. Now that same photo is just meh, because it's not as novel. If that garden shot above didn't have the hose laid out like it is, I think it would be a lot more boring of a photo.
Overall, drones are just a way to take a photo from higher up. To say drone photos are gimmicky is to say that putting your camera low to the ground and pointing it up is gimmicky. Sure it may not be your style, and it's probably not worth the $500+ to most people for the ability to move your camera higher, but it's just as real of a composition tool as getting low to the ground.