Thankfully, there's a simple workaround to get back your old fashioned grid workspaces!
Instructions:
1. Download Gnome Tweak Tool
2. Download the workspace extension code
3. Copy the workspace-grid@mathematical.coffee.gmail.com/ directory to ~/.local/share/gnome-shell/extensions/
4. Open Gnome Tweak Tool and enable the plugin
Hope that helps! Please let me know in the comment section if you have problems.
