I like to think that talking about it in the right situation helped me distance myself from it and come to the realisation that I wasn't this awful excuse of a human being that I was being told I was.
It was shit. Utterly shit. It wasn't my fault, it happened to me just as much as DP can talk about how he broke his leg. Talking about it with decent people meant it wasn't that shameful secret that had to be kept because it was really my fault (that'll be the ex, a sibling and my mother talking there - not me). Why should I keep their shitty little secrets for them? They thrived upon secrecy and lies to give them the high and satisfaction of that feeling of power - well, they don't get it now I'm not that terrified, abused and vulnerable person they could bully and scare into silence.
The difficulty comes when people assume it's only a particular sort of child that experiences the aftermath and not fully grown adults that carry it with them one way or another. I've been at safeguarding training where they've thought it appropriate to re-enact a scene (and frankly, the way they re-enacted it, they clearly didn't have a scooby about what actually happens). Because I had been able to put some distance between what happened to me, in that I'm not ashamed, I could speak to them afterwards and explain why I thought that approach had been inappropriate without considering how some people in the room could be feeling as a result. Quite assertively when it was initially dismissed, as it happens.
It's part of me, but it's not exactly the most interesting thing about me (or to me). I'm not viewing myself through the lens of being a victim or survivor, it's nasty shit that happened, it still sets off some of my responses - I don't accept being shouted at by adults, for example; which absolutely took the wind out of the sails of an employer who was used to being able to get staff on their own and then shout at them until they cried - my quiet refusal to go into a room alone with them with nobody else around completely stumped them right up until they were compelled to apologise to me following my subsequent grievance (and I didn't have to disclose my history, it was purely that their behaviour was unacceptable and I knew that whereas others hadn't realised it was abusive because they hadn't experienced it before) -
But it's not the sum of my being. They're experiences, not my personality. I don't give them that power over the rest of my life. I learned from them. I learned to have utter contempt for adult bullies. I learned how to identify and as a rule avoid abusive behaviours. Just like DP learned to not go downhill on a skateboard without making sure he could stop after the experience of doing this and finding out that he couldn't stop upon reaching the little bumpy bridge going over the river in his village. 
And to be honest, it makes day to day stuff a doddle in comparison. I'm not going to get upset because a teenager is being gobby or DP has snapped at me. I'm not going to panic and run away crying because I've been told somebody isn't very happy with my tone. I've dealt with far bigger and far scarier.
Talking about on here hopefully helps other people see that they aren't the only ones to have experienced abuse or neglect. I'm not using it for catharsis or because I'm 'triggered' - it's because it happened, I understand and it doesn't have to continue or become the only thing in your life.