This plugin hasnt been tested with the latest 3 major releases of WordPress. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.
With newer version of WordPress you may need to use the following which will leave the Toolbar available in the Dashboard but hide it on all front facing pages.
Does exactly what it says it does. Only problem is that it also seems to disable the dashicons font which I need in my theme.
EDIT: Actually, it was my fault. I hadn't enqueued the dashicons font properly. This plugin actually helped me fix an issue I didn't even know I had!
If anyone else is wondering how to properly use the dashicons font in your frontend, this is the article that helped me out: