Traction control effective off-road?

Hi, just purchased a 2 wheel drive 2006 Sequoia SR5, with the Sport Package. I don't see where a factory locker or limited slip is even offered. How effective is the traction control? I won't really be going off-road. I'm more concerned with steep muddy or snowy roads and driveways, etc. I live in Florida, but go to western North Carolina in the winter time. Does anyone know the standard rear axle ratio? I can't find that anywhere-it's not even in the vehicle brochure. I'd like to hear of your experience with traction control, in the kind of situations I'm anticipating.

Can somebody give me their opinion? How well does traction control work in the real world, during slippery driving-especially muddy or snowy inclines?