I can't speak for everyone and I'm a multiscreen type, but for me I have things on specific workspaces.
Workspace 1-4 Primary monitor (center, ultrawide, landscape)
Workspace 5-7 Second Monitor (left, portrait)
Workspace 8-10 Third Monitor (right, landscape)
1. Browser and terminals/vim for current project (ultrawide monitor = 4:3ish split)
2. As above if I need to switch to another project
3. As above if I need to switch to another project
4. Spare/"Personal" slacking off things like HN
5. Comms Slack/IRC etc...
6. Spare/Displaying things that work will in portrait like reading PDFs
7. Spare/Monitoring specific things to do with what I'm working on
8. Spare/Background noise videos
9. Music player
10. Email/Calendar
For me I usually sit with 5, 1, 10 visible across the 3 monitors 95% of the time which means I can see everything I immediately need. However if on a single monitor device the workspaces have the same use (mostly, 1 might get split into 1 = Terminals, 2 = Browser because it's a bit cramped on 16:9).
This means If I need my emails I hit Mod+0 which then focusses my email/calendar whether it's visible on my 3rd monitor or hidden on a single monitor setup. Or Mod+5 and I get Slack.
Once it's in your muscle memory you don't even think about it. The way I see it is it's like vim, once you have the shortcuts in your muscle memory you don't even think about where things are, they just appear when you need them.