This the list of apps that you can safely freeze in your Samsung Galaxy S3.
PLEASE DO A NANDROID BACKUP BEFORE YOU START FREEZING, just incase you make a mistake.
(I uninstalled Touchwiz Laucher mistakenly one time and it was the only launcher on the phone, my nandroid saved me. :D)
ChatON (convert to user app then delete if you want)
Google+ (convert to user app then delete if you want)
Maps (convert to user app if u want) and yes, I never use it. :D
Samsung Cloud (all those cloud things :D)
Samsung Push Service
S Voice (waste :P)
Software Update v2
Software Update v5
Pls, only Freeze the ones you don't use. Not compulsory you must freeze/remove all. Most of the stuff on this list, me 'PERSONALLY' don't need. :)
I will add more to list tho...