My brother learned on manual because he's older and got the old station wagon as his first car.
I learned on automatic because that's what my mom's van was, and I bought own my first car, which was automatic.
When that went caput, my brother happened to be in the military and left behind a car that was the exact same make and model as my car was, only manual. So, I figured, I need a new car, my brother's not using this one, it's just like mine, I'll have mom/dad teach me to drive it. I learned and was doing alright with it. We lived in a valley so I mastered hills straight away. But then...
The first time I decided to take it into town by myself (we lived out in the middle of nowhere so I drove empty backroads on my own) I got really nervous all of a sudden and was just driving terribly. But I made it in one piece with little incident. On the drive home, however, I stalled in the middle of an intersection and began freaking out because I couldn't get the car to start, and people were honking their horns and shouting at me. I managed to get home but I was crying the whole time and was so traumatised that I just never drove it again (I was 19, so gotta cut me a little slack on that!
)
I'm at the point now where I would like to re-learn it because I'm a much more confident driver than I was and, like others have said, it would be nice to be able to drive any car. But I don't have the time/money to do it and for now I'd rather just get my automatic license and a cheap second hand automatic that will get me to the train station or to the supermarket.