When you say "gaps", do you mean space between windows? I do that. Seeing a bit of the wallpaper is like seeing a bit of your desk between papers. Helps with mental context switching. Window borders probably serve the same function, but they've never worked as well for me.
Seriously, so useful for floating window managers, it’s a simple and obvious form of transition, significantly better than what window managers have ended up at these days (if anything).
(Then I switched to i3, and more recently Sway. Not sure I’d appreciate wobbly windows in tiling window managers, though maybe with gaps (… which I’ve never understood the appeal of) it might be better.)