Muscle memory from I don’t know which OS has got me used to this feature, and it seems to be better than just using the arrow keys. I understand I have to click on the app to activate it (unlike moving around with the arrow keys), but it would be cool if it just activated as soon as the mouse was over it.
settings > window behavior has a lot of options w.r.t. what happens when you move your mouse or hover/click on various parts of a window.