You have to think of it like "This desk is busy with some work, let's go to a free desk". So I can have a workspace with my Email and IM clients, one with my music player, another for my leisure browsing, and two each with an editor and a browser for the programming projects I have open.
I'm currently on i3 right now and I have 10 static workspaces (6 occupied):
1. Emacs frames (5 of them)
2. Browser
3. Terminal
4. Terminal (temp), but more often have calibre there, and other random gui tools.
You can tidy it up, but mentally it's that there’s a room for activity X and a different room for activity Y. It’s about this mess over here is unrelated to this mess over here.
There is something of “if the room is too messy don’t tidy it, just move to another room” in it that bothers me.