I'm a BEd myself so I didn't have the experience to go into a PGCE after a BA.
But I don't find it unbearable at all. I have had three practica, and have had additionally taught in six other schools. Obviously there have been challenging moments in the classroom, but you learn and you improve. I was also never alone in school - when I encountered problems, I asked other teachers for advice, even to see if I could observe their lesson with the same class to reflect on my own practices.
I think a major reason why people dropped out because they did not have good degrees themselves. It probably meant they were not used to working hard, doing things NOT last minute, or having the ability to do things efficiently. I personally do things very quickly, and have always completed my assignments like a month before the deadlines, and so in a school, I think it helps me to feel better not having the need to rush things through the very last second.