Long-time player and forum lurker here.
To be honest, one of the biggest overall problems with VS is the amount of initial investment it takes to progress the game; for that you need appropriate land and you bet you'd want it to be perfect. This strive severely limits the areas you can actually settle down to have unrestricted growth, while also sporting decently nice views around. I found out, it often takes countless hours of running or "cheating" by flying around to scout the perfect spots and that's not where the searching ends at. You need appropriate geological structure, access to all resources and minerals... then you'd also want to have the good traders around AND most importantly - the area needs to be relatively safe and sound, with possibly no temporal instability; bonus points if it's very stable underground as well and there's caves with stuff below. There's so much to factor in, but when you find a perfect spot, It's like you won at the lottery, haha.
After spending some time in 1.18, I have to confirm the terrain is... different. Quite vastly, I'd say. The length of fields is bigger, the distance you often have to travel between ranges also grew. In comparison to previous maps, the world feels much bigger but in a way, it also seems less diverse; that said, it's difficult for me to say whether it's better or worse. I'd say it's different and in my case, I kind of grew to like it as the time passed. In overall - minus the new strange generation glitches, more "floating rock formations" and some uneven terrain generation - it does feel much more natural and realistic; the upheaval is responsible for it in the most part as it doesn't change the generation, it simply raises the terrain it is on, creating these natural, wave-like hills which definitely add to the overall feel and can produce some really nice looking vistas. I'd say it a move in the right direction but it'll need tweaking; luckily, everything in generation can be configured to your taste. From what I've checked, if you reduce upheaval to zero, it will produce very much pre-18.1 landscapes.
My main complaint is that new generation is incompatible with pre-18.1 and produces vastly different results now. It's understandable, since game is still in active development so we have to deal with it occasionally, but it was still disappointing when it turned out I won't be able to play on the world I previously managed to get.
That said, I'll share one nice new seed here: 801461586. you will start in the hills; the terrain there is nice if you want to settle down for sorta Swiss feel; that said, if you'll move further to the west, besides the dunes, there's a vast open field with a mountain range to the north and forest to the south. It is very stable temporally and best of all - has quite good deposits of iron underneath and there's plentiful of resources in the area, whilst the surrounding biomes have a lot more to offer as well. Best of all, there's a survival goods trader at the edge of the field! I highly recommend it for a fresh new start.