I've been using a controller since Day 1. It works great. Since I'm on a PC, I still have access to all the regular hotbars, in addition to the cross hotbars; I put non-critical things on those and activate them with the mouse.

I try to keep similar abilities in the same place across jobs, making muscle memory easier. I also have a regular horizontal hotbar with some normally hidden OGCDs so I can watch the reset timer easier. Some jobs, like RPR, I struggle with action placement, but most jobs aren't bad to set up.

The in-game help and text aren't very intuitive, but it is an easy system once you get the basics down. Targeting can be an issue, but KB/mouse players also complain about Tab targeting, so I'd call that a wash.