Yes you heard it right, TouchWiz can be killed without hack on the Samsung Galaxy S4. Installing a different version of Android does the trick, but you need to root your phone to do so. But we do not recommend going through this procedure for newbies. If you are not used to the regular interface of Samsung, there is another process you can follow.
All you need is a Launcher app from Google Play. What it does is removes the new interface on the Galaxy S4 and allows you to turn it back on within the Settings menu. Some of the top launcher apps found on Google Play are Smart Launcher, Next Launcher and Action Launcher.
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