i'd love for you to be in any party with me and try to tell me i am not being efficient as my dps out does yours. good organization is key to using either method. me having all of my mostly used abilities together on the same bar is the same as having them numbered 1-10 and pushing a button. the only time i can see that there may be an issue with efficiency is when targeting when there's multiple mobs. in that case there's the same issue with keyboard and mouse in either clicking or hitting f8 to scroll mobs.
using a controller let's compare it to using a keyboard and mouse.
-crafting = edge controller i can sit back and craft while either smashing enter on your keyboard or clicking the items manually.
-movement = edge controller. with the analog buttons it is much easier to run around and adjust your camera as needed to see your location.
- sorting inventory or gearing up = edge controller. inventory is much more efficient using a controller. it's hillarious watching a kb/mouse video and how slowly they can do basic things when the controller can cut the time in half.
- battle = toss up. an organized person will have no issues with either method. to me the controller is much easier and faster to use.
it's a personal choice because our main healer used kb/m and he enjoys it, but you are ignorant to think using a controller makes anyone a worse player. how long do you think it takes to scroll from one spell to another? from one spell to another you have 2-5 seconds before the other goes off. if you can't scroll to your next spell in that time you have other issues to have looked at over the fact it's a controller slowing you down. you may want to have your mental capacity looked at.
i get in parties with people that only use kb/m all the time and i am always on top of the parse lists. using a controller has not slowed me down or made me more efficient. now granted, there is probably some that lack the mental capacity to set it up to be efficient, but that's not saying it can't be done.