I think that for the most part it is the person asking the question that is either worried about the shoots hurting or that shoots have hurt them in the past.
I would a agree that now a days, dentist have made getting a shoot much less painful if you have any pain at all. There was a time that they did not numb you gums first before giving the shoots and a course that did hurt little more.
I can not say just because shoots may not hurt me that it should not hurt others. People do handle pain differently. So maybe the fact is for the few people who say shoots hurt is because for them they do.
In the end it is getting your teeth fixed and dealing with what needs to be done in order for that to happen.