I use Debian + Gnome without custom extensions and like it.
I don’t use too many programs, so in the overview I have Firefox in position 1, signal in position 2 and steam in 3. Then I use Win+1,2,3 to launch them.
For other programs, I hit Win and then start typing the name and hit enter.
For switching between windows, i use alt-tab or alt-(key above tab). If I have many windows or playing game in full screen, I hit Win-key once and choose the window i want.
I don’t use workspaces, never found a good flow. And I rarely miss a taskbar.