I've installed a dozen more mods and am starting out in Skyrim once again. I can't remember any other one that's made a bigger difference than this. Finally my personal version of Skyrim has forests that feel like real forests, where you can't see all that far a lot of the time and it'd be easy to get lost if you didn't have a compass.
Sure, that is achieved by making the trees fantastically big and closer together than you'd expect for such giants, but it makes sense to me and it looks great from ground level when you're in the woods. There's obviously less gravity on Nirn judging from how high I can jump carrying a 200kg backpack, so why shouldn't the trees grow bigger? The only problem I've seen so far is that wild animals occasionally have trouble navigating, such as an elk that just ran headfirst into a tree instead of going anywhere. But they do that kind of thing sometimes in pure vanilla Skyrim as well.
It's just beautiful. I prefer "mythic" mode. It's what I always wanted in a video game forest.
