Thanks for that, Dean, it is great that you've put it this way, as at the moment I'm discovering new things in the scenery all the time, and it would be a shame if I was the only one getting excited about it:)
I have thought about this before, exactly what it is which 'improves' the normal simulator, what works and what doesn't, and one of the things it comes down to is 'scale'. I've tried to
explain this before, back when FSX was first released, and I still come back to the same thing.
FSX increased the default ground texture resolution from FS9's 4.8 metres per pixel, to 1.2 metres per pixel. This was a huge step forward, with the ability to get in closer and still retain detail -- this improves the scale of the sim, as you don't need to view from such a distance to get a feeling of immersion. The original Real NZ/Godzone photoscenery was slowly improved from FS9's 4.8 m/px to 2.5m/px, which was the actual resolution of the source images, but still not up to the FSX default textures. So this was a bit of a compromise -- you could have photo scenery for realism, but you would need to give up some detail, so it was better for those who knew a particular area, but not such an improvement for anyone who just wanted to fly anywhere different.
But now, as time goes on (8 years since I wrote that post) we now have better aerial images, and the infrastructure to deliver much larger files over the net. And the default FSX texture resolution can now become the minimum photo scenery resolution, with the option to increase this locally for even more detail.
So a 1.2m/px photo of a gully around Lake Wanaka, for instance, combined with an elevation mesh depicting that exact gully, gives a much greater degree of realism than a 1.2m/px landclass texture on the same mesh.
Sure, there are still issues with I've mentioned before, such as the variable quality of the photoscenery, but as I normally start with more detail than the default textures, there is still a lot to be gained.
It is weirdly exciting to be seeing some of this scenery for the first time, I think that describing it doesn't touch the surface of what it can add to the experience. So this is also about the most frustrating time for me, knowing that turning this into a successful 'product' is still touch-and-go. But it does keep me working a lot of hours, so that I can see more scenery:)