I've used i3wm for a long time now before switching to hyprland. The top useful thing: Workspaces. Even without tiling, workspaces give a massive productivity boost. You can have email clients open on one, monitoring systems on another, browsing on a third, gaming on a fourth. When you combine with tiling, everything is in its own perfect space and nothing overlaps. This is especially useful on single-monitor or laptop setups as you don't need multiple monitors to keep track of everything.

I also see people struggle with notifications tiling. You probably don't want a bluetooth connected message to take up half your screen, so you'll want to make sure to properly configure those things. At least in i3wm/hyprland, you can use the window class name to exclude a window from tiling (ex. for_window [class="mako"] floating enable or windowrulev2 = float,class:^(mako)$).