I use many KDE activities all mapped to a single hotkey. Meta+H, Meta+J, Meta+K, then L, Y, U, G.
I set my browser and maybe one other as sticky to show on all. I also have specific desktop picture for all of them.
On top of that I have a startup command that opens all applications I use for work. Each application is configured to open in a certain activity.
The end result is that instead of doing Alt-Tab or looking for the window I do Meta+Key and it's there in front of my eyes with focus.