Has the Batch Build option been removed in Visual Studio 2012 Express?
It turns out the Batch Build... feature still exists in the Express edition of Visual Studio 2012; it's just been hidden for some reason.
To access it, you can either assign a keyboard shortcut via menu Tools → Options... → Environment → Keyboard and finding Build.BatchBuild, or you can add it to the Build menu and the Solution context menu, where it used to be, via Tools → Customize... → Commands. The Build menu is under the menu bars named Build and the Solution context menu is under the context menus named Project and Solution Context Menus | Solution.