I am one of many users who don't like privacy intrusion, especially with what WhatsApp has done recently with 2 Blue ticks feature.
Prior to this update there were just 2 grey ticks which implies that the message has been sent. But now with the inclusion of blue ticks, I feel Like right to my consent (Whether I choose to reply or not) is affected. So therefore I've decided to switch back to the Old WhatsApp & so can you.
Download the latest apk on http://www.whatsapp.com/android/current/WhatsApp.apk installing this version disables the blue ticks feature. However this feature is limited to android users those who download the app from website, and will be available to all soon via playstore/app store.