I don't use touch wiz i downloaded Nova Launcher and use that its alot faster.
I'm also thinking about Rooting the phone and loading a custom Rom with the Stock Google Android OS 4.3 but don't have the balls to do it yet.
some of my fav apps:
RetroArch - plays your old Sega, Nintendo, PS one, Arcade games very awesome and even better if you configure your PS3 controller .
VLC Player - Just like on the PC
Win amp - early 2000 throwback.
U Torrent - saves having to turn on your computer to get those latest episodes