Sounds like Ubuntu's Unity to me. My 2 cents: Now that I'm using two 4K panels I very much enjoy having 4 windows side-by-side (optionally even splitting those

Sounds like Ubuntu's Unity to me. My 2 cents: Now that I'm using two 4K panels I very much enjoy having 4 windows side-by-side (optionally even splitting those vertical "columns" horizontally to hold 2 windows). No more task switching, all I need is always visible - I personally wouldn't opt for a tab-based full-screen WM.