I've run dual 23/24" monitors for a long time. Years ago I looked briefly at multiple desktops in Windows 10 but didn't have a use for them.
A few weeks ago I had to work with 3 clients simultaneously, each with multiple documents plus browsers and remote desktops open. I was going crazy trying to juggle everything on a single desktop, even with dual monitors.
Being able to separate the clients into separate desktops was a lifesaver. In that situation I ended up running 4 desktops, one for each client plus another one for my company with open invoices, Outlook etc.
I haven't had much use for the Task View button on the Task bar which is enabled by default so I hide it. Instead I use keyboard shortcuts:

Ctrl + WindowsLogoKey (WLK) + D --> new desktop
Ctrl + WLK + Right/Left arrow keys --> navigate between desktops
Ctrl + WLK + F4 --> delete a desktop when you're finished with it

All of the above operations are basically instantaneous so there's little loss of productivity.
The only "gotcha" I've hit so far is if an app on one of the desktops is capable of "eating" the navigation keys Ctrl+WLK+Right/Left, in that case the desktops are not switched. For example, Remote Desktop Connection eats that key combination, so if you have an RDC session open, and it has the focus, and you press that key combination, RDC passes it through to the remote computer. You need to change the focus to another monitor or another app which doesn't eat the key combination for it to work.

I imagine this isn't news to many but it's something worth knowing about for anyone who needs to manage a lot of docs or apps simultaneously.