Why does my Samsung Galaxy S3 no longer vibrate (except for right after boot)?
In my case I had turned on power savings mode. Am not sure but I believe that in 4.4.2 power saving mode comes with "Disabling Haptic Feedback" turned on. This can be rectified by going to Settings->My Device and then clicking on Power Saving Mode. There uncheck the "Disabling Haptic Feedback" checkbox.