Ok I have calmed down and now that I have everything working (again) I can start testing. Mostly I check out extensions to make Gnome-shell flexible again. And there are some very good ones:
Shellshape is such an extension. It lets you handle you windows mostly with a combination of the <SUPER> button. Or from a menu.
Now I can snap the active window to one side with <SUPER> ("Windows key") + -> or <-
Lots and lots of ways to organize the workflow there.
The
Panel Docklet v13 is also great. As usual you install it as addon from
https://extensions.gnome.org/Much like Firefox addons.
This will give you a panel where you can drag and drop + a lot of tweak options available by right-clicking the panel.
Now this really brings some flexibility to the table:
This extention represents all opened windows as Icons. There are lots of possibilities for customization. It can be used as a docklet, panel or as anything else you create. It also supports multiple screens, workspaces, window-titles, favorites, dragging...