Uldah is just way more balanced, its main area outside of the aetheryte is never packed full of people like limsa or gridania and it has a super simple layout and lots of space inside and right outside of its gates.

imo gridania is really used way more for events, most of them use its Amphitheatre anyway, especially holiday stuff.

and any job quest regardless of where it starts is gonna take you all around the map anyway, i dont really see anyplace being used more than any other.