I find controller to be leaps and bounds easier than the keyboard setup. On Target Mode A I can set my target type to enemies so then Left/Right on the D-pad is enemy targets and Up/Down is party members. Works like a charm even for healing. Add onto that I can switch target types in less than a second, it's a pretty versatile control scheme.

I couldn't imagine doing gathering with anything but the controller though. I don't feel like I've got as much precision with the keyboard.