I also found that having a DD was the biggest trigger. Although I already had a DS who I of course adore, there were no boys in my family growing up and it was somehow possible to compartmentalise my parenting of my DS from my mum's treatment of me. When I had a DD, it all began to fall apart, because I could see myself more clearly in comparison to my DD and I got so angry with my mum for the things she said and did, that I can't ever, ever imagine saying to my lovely, sensitive little girl. Of course, the same applies to DS but it didn't hit me between the eyes in the same way.
I'd seen myself as simply a punchbag who just had to take all my mum's abuse and mind games and criticism and never complain, for fear of upsetting her. But I could see my DD as someone who I loved and would never do that to, and finally I could see that I hadn't deserved it either.
5 years on, I have been through a big change and finally managed to see through the guilt and the feeling that I always had to be nice and tolerant with my mum however vile she was to me. I have cut off contact with her and I feel much better. I have "let go" of having to keep her happy – why should I? So in my experience, yes it can hurt less, if you can make that leap – but it's not always easy to make. It's taken me years.
It does still hurt that I didn't have the mother I needed, the love I needed, and it hurts when I see other people who do have it... but not getting it from my mum – I now accept that, I see that she's just not capable of it and it will never happen, and in its way that is a relief. Knowing I can try to be that nice mum I should have had, and break the cycle, is a help too.