So I've seen a lot of similar posts in many of the other threads, and I feel like I'm at least a competent explorer myself. However, I'm struggling to understand how people can tell from glancing at the system map what the relative distances between planets are, or the size of rings, the types of orbits, whether or not there's interestingly deep canyons, etc.
Yes, it's great to see at a glance how many bodies are in a system and their relative alignments, but without clicking on each and reading/digesting the orbital information about each, I fail to understand this oft-claimed "at a glance" from the System Map.
This is a genuine query btw (I'm currently out on a short mapping expedition) so if there are hints and tips for the current system, please share!
As to being on-topic, I'm personally cautiously optimistic about the proposed changes and very much looking forward to seeing them in action (livestream and beta). Until then I reserve judgement.
I'm now behind by two pages on this thread, so forgive me if others answered. The answers probably vary anyway.
Orbiting bodies you can tell the orbiting distance by (as you say) clicking on them. But that's tedious to do too many times. But there are other telltale signs that something is interesting. For example, colouration that indicates some volcanism (so for metal-rich and rocky, going from beige to a more orange colour) also usually indicates that the body is quite close to its parent body (assuming it's a moon). So I'll usually click on those and at least glance at the orbital period and radius. If both are low, it's likely to be more interesting. Another sign might also be how spherical the body is. If it has a more pronounced egg shape, it's again likely to be a bit more interesting. (There aren't many terrestrial examples of this I can think of, though. I'm not sure I've ever seen a landable that wasn't either pretty close to a proper sphere, or, a potato) Tiny moons/planets can be spotted as well, but that's harder if they aren't next to a very slightly larger body. I don't know what the size threshhold is for when it shifts to the larger planet image size, but now that it occurs to me that there must be one, I'll probably try and find it.
You can also get a sense of a planet's "texture" from the image. The more scratchy looking it is, the more likely it is to have some good canyons on it. This will vary by planet type, of course. But you look at enough of them and you get a better sense of it. If you'd like I can dig up some examples later.
Rings you can get some info from colour. The giant ones are visually distinct, and again I can give you some examples if you're curious. If there's a huge ring on a planet, once you know what to look for you spot it immediately.
Feel free to PM me the system map, if you'd like. Or system name if you'd like some help and aren't too far off from where my current location will be when I run out of fuel later today (I'll be Colonia, already contacted the rats as a formality, but I knew going in that they wouldn't be able to help me. I intentionally stranded myself at Systeia Free AA-A h2, and it's worth a look because nobody has made it this high before! Yes, I'm nuts.)