You can quickly make text bigger or smaller by hitting ctrl+ (bigger) or ctrl - (smaller). Works in a browser and Adobe products like photoshop as well. why doesn't it work in Microsoft Word?
http://answers.microsoft.com/en-us/office/forum/office_2013_release-word/page-zoom-in-or-out-keyboard-shortcut-for-word/bc6d388b-f040-4389-8131-a4856ff9a5ff
Thanks - I keep forgetting to use keyboard shortcuts