Intuitive operation comes natural to you
Distinct colors make you understand at a glance
Supports cross-monitor without limitation
Grid~ It's much easier to differentiate source code and do code review. To track log from my servers and clients, its straightaway hotkeys allow me to shift console windows cross-screenly
Sometimes I need to compare one image with another to see look and feel. Grid is helpful. Feel comfortable when design layouts of books and magazines. It relieves my pain while working.
Um... Grid is convenient to me while I am livestreaming a game show. Move a game window in the center of screen. Meanwhile, open one Facebook page and one Youtube page. Fleetly resize and align them. Grid indeed save my time.