Similarly to Onyx and PZ - I go because it makes me feel good about how I am doing IYKWIM.
I also like to know how they are going in their growth etc.
And lastly, it is good to be able to see someone that is more independent than a GP that can put a bit of a monitor on my mental health.
On top of that the first two visits so far she has been able to help me talk through the birth of DD, and that was invaluable.

I do tend to not tell them things they don't want to hear - my current one would not support co-sleeping for example.
So I don't tell her about it. The way I do it (when I need to) is safe, so I am not worried.
She is a lactation consultant so I know that I don't need to worry about BFing, it also means I know where I can access one if and when necessary.
My last one thought bLS was great so that was reassuring for me.

Also some MCH centres, depending on the local council organise mum's groups.
My one doesn't, absolutely shattered as I am too anxious to just rock up to a playgroup to meet people.