Hi wvcowgirl,
I can relate sometimes. I have two girls 10 and 8 (and a boy that is only only enough to point and grunt at the cows), and there are many things that you just can't do alone. My dad grew up in th 40's and he was milking at 5, driving a tractor at 7. These kind of thoughts scare me with my kids. I do like to get em involved, my 8 year old is the official counter when we go into a paddock with cattle. But I've seen so many times when tame cattle get spooked and do weird things (my dads recent unwilling "ride" on a 500 lb heifer was a sight), that about the most dangerous thing that I let my girls to is open/close the gates as the cattle go through. They also make great note takers when working cattle. Ofcourse sitting in the back of the truck.
I do agree with you that herefords (we call em whiteface down here) are very docile, and I would much rather work 100 herefords than 50 of my brangus'. While the brangus can be tame as well, there's always one that gets hotter than hell in the process. Too hot, and she's gone, I don't care how good she is. On that train of thought, I wish more people wold cull for disposition. I can't remeber who, but one of the members puts "culling prevents 75% of your problems", and I agree totally with this. In this day and age, all breeds should be docile.
Sorry for the run of the mouth, as you can tell, I'm long winded.