Handy Island Gathering Macro

You can use the following macro to lock-on automatically to the closest node and Isle Sprint to it. It won't automatically gather for you though, and some nodes might require jumping across when your character cannot simply autowalk to it. It might also rely on your targeting settings (I couldn't target things behind me when my setting is at Cone).

/targetnpc
/gaction "Duty Action I" <me>
/lockon
/automove

To add on to this, pretty sure the fastest place, if you're just looking to grind out exp quickly, is at the top of the mountain that requires flight to reach.