The plugin allows you to temporarily or permanently filter certain words from the 
title, content, excerpt or tags in posts.
You can choose where to search exactly or select everywhere in the posts. The 
original content of posts is kept safe. You can always go back and show the 
original text.

GSY Content Filter

Filter words from the title, content, excerpt or tags in posts.

tazotodua

After activation, you will have an additional checkbox, so you can temporarily hide(disable) any widget from visitors.
<blockquote>
(P.S.!! This is a LIGHTWEIGHT (NON-SLOWING) Plugin. See other <a href="http://bitly.com/MWPLUGINS" rel="nofollow ugc">MUST-HAVE PLUGINS</a> for everyone. )
</blockquote>

Hide(disable) any Widget temporarily

Hide(disable) any Widget temporarily with a simple checkbox.

GSY Content Filter vs Hide(disable) any Widget temporarily