I never wanted to do anything else but teach, and would happily do it all over again, honestly. If I was young again, that is! Hard work, lots of changing demands, but the most rewarding job in the world. (In a big, South London comprehensive.)
I can understand that INSET days interfere with, and cause problems for parents and carers, but, as others have pointed out, they really are essential. I suppose schools could add the days to the end of term, and give the children an extra few days' holiday. Many now provide breakfast clubs and after school clubs, which I think help hard pressed parents a bit. Working parents have it so hard these days. I qualified and trained with three children at home, so I do have some idea.
As for strikes - well, I never have quite seen the point, but that is another issue, and a road down which I do not want to go!