One thing that makes Godot smoother in my experience is its project structure. It doesn't use traditional ECS, but relies on inheritance and composition. Combined with the "everything is a node" mindset, it makes it much easier to maintain a mental map of the game. The node hierarchy tree is much more revealing than in Unity atleast (I've dabbled in both).

EDIT: This doesn't just apply to 2D, so maybe it's a weird reply.