For me it's building. I love the style of the game. The landscapes are beautiful and i can spend Hour's on a Build.
But i use Mods. And when i don't be in creative mode, i use even more mods because yeah, the game itself for me personally is more annyoing than challenging. And the World itself is quite empty when you don't put youre own stuff in it or mod it.
There are mods who add Animals and extra Landmarks. Mods that make taming make sense and be usefull. Ect.

So ... yeah, mods are the key for me personally. The different, quite unique artstyle has attracked me, but thanks to mod's i play to this day.