WorkspaceBar Gnome Shell Extension!
Access to your workspaces from the panel in a similar way as the Gnome 2 workspace switchers. It supports mousewheel scrolling. It currently centers the app in your panel next to the clock. I suggest using Frippery Move Clock extension to move the clock to the right side of the panel to free space. I will add a setting for this soon as well as an automatic Overview mode option.