I rooted my phone and mainly did so to be able to use Titanium backup and tethering. Our SGT is Wifi only, so we do not see much need to root it. The only thing worth backing up is my wife's progress on Angry Birds Rio! Other than that, pretty much everything is in the cloud already, so there is not even a need to backup.
BTW on my phone, I use Titanium more to force apps to the SD card than I do to backup. My phone only has ~220MB available to apps, but the SGT has more than enough space for our needs.