I use xfce, and have Alt-Left half width full height on the left, Alt-Right does the same on the right. Alt-up is half height, full width on top, Alt-down on bottom, and Alt-F10 maximise.

I tend to only use the mouse to point to the window I want focus on, although on the occasion I do use a mouse I have it that dragging to the top/bottom/left/right does the same behaviour.

I had to really think about those shortcuts (on my phone at the moment) as it's just muscle memory.

In xfce you can switch that behaviour off in Window Manager Tweaks and the Accessibility tab. Not sure about Gnome shell.

I never noticed until now. (After just posting a comment that I stuck with Xfce to avoid crap like that...)