I love the pale garden and how it's like a parallel to dark forests. I love how the two divert expectations.
Dark forests, despite their name, are saturated and full of life. Even compared to regular forests, there's a lot more biodiversity than many of the "basic" biomes. There's three whole different trees found there, giant mushrooms, and plenty of flowers. They're one of the biomes capable of spawning a lush cave underneath it. It has its dangers just like any other overworld biome, obviously, but it's nothing overly more than anywhere else. Traversing it can be tricky sometimes and illagers may take residence in the biome's woodland mansions, but it's ultimately a very colorful and lively environment.
Opposing it is the new pale garden. Usually white and light colors are seen as pristine and good, but the pale garden takes it the opposite direction and goes right into uncanny valley territory. It has none of the color of dark forests, none of the biodiversity, none of the liveliness. It has trees and moss that look familiar, but something is off. It has a signature mob, but even the creaking is just a puppet of the trees, not really sentient, not really even plotting against anything. There's "life", but, once again, it's wrong.
I think the pale garden is a wonderful addition to Minecraft's world building as it is, but the deliberate parallel to dark forests? Delicious.