The gate-towns are sometimes just places to pass through on the players' way to their destination planes, but sometimes they're interesting places to be in their own right. I had a game once where we spent some time in Rigus due to a character's Mercykiller affiliation.
This isn't entirely a Renovation thread -- although you're welcome to make wholesale changes if you like! It's just a place to collect ideas for observations about the gate-towns, or things to do there, or changes you'd make, etc. I'll start off with a few ideas.
The Great Wheel cosmology is understood to be a metaphor, since after all planes are in no spatial orientation to one another. But in a very physical sense, it's not! For some reason, whatever forces shaped the Outlands decided that the major gates to the other Outer Planes are arranged at roughly equal intervals, all in a rough circle, organized along the two alignment axes.
Now, it makes sense that they're all in a ring a long way from the Spire. The Spire would repel strong alignment influences, and if the gates were any further away they'd fall into the Hinterlands. But why is every plane on the opposite side of the Spire from its alignment opposite? Is there some kind of repulsive spiritual pressure? Does the Great Modron March keep everything from shifting around too much? Did gods arrange this by general agreement, so that opposing celestial factions would find it inconvenient to march on their enemies? After all, if Rigus were a day's march from the gate-town to Arborea the Powers of the Elves and the Orcs would likely be seeing constant combat over the intervening space!
It's less remarked, but some planes have multiple portals to the Outlands. Carceri, for instance, has portals off-plane, often to the Outlands, every five orbs on the uppermost layer. Ironically, the imprisoned inhabitants can't use them -- only planar travellers -- and since the inhabitants hate this, they're one of the biggest hindrances to people getting off, surrounding the portals on the Carceri side.
A gate-town administrator who wanted to prevent their town's ideological slide might find it very convenient to order the migration of the gate-town from one strong portal to another every now and then, freshening the place up and reaffirming its presence on the Outlands. Naturally this comes with a lot of grumbling, lost travellers, people on the other side who don't want to lose business, etc. Plenty of opportunity to raise some tensions and make a quick buck.