I do use snapping for some things like my IDE, and use the side by side once in a while, but generally don't use snapping. I have used the Pop Shell on my work computer where I tend to have a lot of terminals and little windows open on my big 4k monitor, though 90% of the time I leave it off. Generally speaking I just use small free floating windows and use alt-tab or Gnome's overview to find a hidden window. I dunno when snapping entered the scene, but the first time I used it was maybe a decade ago. It's nice, but decades of computers before that have trained me to mostly not care I guess. You can do tabs in Nautilus and drag files to the destination tab. I do that a lot I guess.

Its pretty simple you can open 3 different nautilus windows or open 3 tabs in nautilus. Not really very different then dolphin's function but I found myself never using that function in dolphin anyway. I have a good example for a many window workflow that I do sometimes which is when I tag my music. Usually I have a web browser on one workspace or the music tagger split in half with the web browser and then I have separate work spaces with nautilus open in 2 windows with some tabs. I do all that alongside a game playing in the background casually and maybe a picture-in-picture window alongside that also open watching a video. I only have one monitor.