Parapunter, it's worth it for the maybe 20% of parents who actually are pleasant, well-mannered and look after their own children.
It's not a huge part of my day, but it's definitely the one that has some of the biggest impact.
Some of my fondest memories of flying are perfectly lovely families and children that I've looked after on board. It's all about how they behave and treat us, as well as having respect for the other pax around them. I suppose the issue is, some parents know how it should be done, why don't all of them. It can't be that hard surely!