I have had both manual and auto transmissions, but in very different vehicles. The manual was a 200tdi defender, which had a really good low ratio box (stock) and loads of torque. The hill climbing/ rock crawling worries never surfaced....just kept on going. (and a turbodiesel needs to keep on going!)
The automatic in my 1800 sidekick is a good match, and fits the relatively low levels of torque better (and I think that the ratio in low is higher....stock). I am glad its an automatic....
One thing that I really miss though, is the engine breaking on down hill twisty bits. I really DONT LIKE standing on the brakes here. Feel totally out of control.
Still, plus ca change...