I discovered i3 when looking for tiling solution and found it remarkably productive.
But now I love it so much and have become so accustomed to its way of managing windows that I find myself mechanically reaching for my mod key whenever I'm on a different WM. I even find it irritating, when on macOS or Windows, to have to grab the window, move it around, adjust its size, etc. Bonus points for the new style Windows windows with controls integrated in the title bar and next to no area to grab.