@yurisizov I have to thank you for putting me onto tweens! I used to think they're useless, but now I realize they're a game changer!
A computational way to animate is incredibly useful for those silly simple animations, like an item de-spawning. It can be more advanced too, like dynamically changing the effect of a shader.
@yurisizov Here's the coolest thing I've done. With a reference to any other node, you can animate *that* node.
For example, I have a bunch of scriptless objects in the group "trashable." I have it set up so that a roomba can animate them disappearing and ultimately trash them!
@treypoling Have I done that? Well, you're welcome then! :)
Tweens are extremely powerful indeed, and I'd say not just for simple animations. Those are a given, but you can do much more complex sequencing. It's a bit hard to appreciate in code form, so I hope some day we'd have a nice visual tool in Godot for that.
Trey Poling 
Yuri