As the title says, I want to know how others organize their planes. Do you use The Great Wheel, are all of your planes alternate versions of the Prime Material, do you have other planes? I wish to know what you have done.
I'll customize it to the setting, though with the thought that if it's not important don't bother with it.
For example, I ran two campaigns in the same setting, 80 years apart. One big part of the setting was why were there all these diverse intelligent races? So I came up with planar bubbles - material planes that bobbed through the elemental planes. Mind you, any material plane would float in the Elemental plane of Fire, and along three separate axis bob along in the Elemental plane of Water, and so on. So it could be moving one way in one and with a different vector in another (though there were currents in the elemental planes, swirling everything, nto friction-less billiard balls.). So when two Material Planes got close, you could cross between them via the appropriate elemental plane.
The Material Plane the campaign was set in had "thin walls" to the elemental planes - it was easy to get through and may deities over the millennium had used it as a refuge to lead their chosen people to. The original inhabitants of the world were underground halfling predecessors, who eventually became the goblinoid races and surface halflings.
The most recent humans had fled a great war against the elves in 13 Great Ships, on a several year journey and most of them landed here. The knowledge that it was planar travel had been suppressed, it was assumed to be another continent.
One of the ships that was lost on the voyage, ended up getting beech here a century earlier then the others (yea different velocities of time), but without any infrastructure or leadership. They ended up losing civilization and eventually formed barbarian tribes with legends of being born (or coming from) the sea.
Dwarves got here through the Earth, massive earthquakes and their whole mountain chain was shifted from one to another. Various other races same type of thing.
I was doing a feywild before it was called feywild (this started when 3.0 came out and ran for 12 years), with the elves having lots of small material demiplanes that wandered. They came through the Air, which was also associated with West in their language so everyone else just assumed they "came from the west". They were the only who did this voluntarily and knew. The ones here were ones left when their demiplane lost conjunction, and it was several centuries (and into the second campaign) when another fey demiplane came into conjunction.
I had a shadow plane that overlay everything, but warped. A bit like the Upside Down from Stranger Things, though well before that. It did most of the duty for ethereal plane for various spells and undead. (Again, 3.x - that was a thing.)
There was no direct version of the Astral plane.
God didn't have physical planes seperated where they lived. There were uncountable gods in the various bubbles and they all needed worship - so gods were ascended but were still attached to the individual material planes. They had demiplanes that were attached to it.
(Quote from the second campaign, where a forest and river were red said to be from the body of a dead god under them. "What was the god's name?" "You think that if there was even a single person left who remembered it, that the god would be dead?")