You can try LaunchUp. Instead of having tons of toolbars all over the screen you can have only those you use the most and use LaunchUp for all other commands.
Btw, there are already menus for extensions. Pretty much every extension (at least the properly made one) have menu entries in categories such as Extensions, Tools, View, Camera, File and Edit. You don’t need to have a toolbar shown for each and every extension you use.