Yeah I played 1.0 on a controller.
Swapped to a KB/M with ARR. However to make this easier I picked up a g600 MMO mouse.
Sadly now I can barely play without it, don't ask me to hit my actual keyboard hotkeys, it's all muscle memory to the mouse now lol.

Now your concern is that you want to get "more efficient" by ditching your controller but in what way?
Many endgame players use a controller, even the high parsing ones we won't talk about. While I no longer personally use one, I don't see the problem with it. SE actually did a very good job optimizing the controls for it so you aren't really left out.