Watching with interest, I go back to work after 7 months next week and DH starts three months paternity leave. I am main earner and defiantly more career focused. I would have said I would only take 6 weeks before I had DD, but luckily have a good maternity package in current role and timing of pregnancy worked well.
The things I have learnt in hindsight are:
Having a baby is an enormous change, which I could only really get my head around after 12 weeks.
Physically (had emcs), hormmonally, emotionally I could not have gone back at 6 weeks, despite being utterly confident that I could do before having DD. for someone who has been career focused (and therefore quite fond of and good at control, organisation etc) I can only liken having children to being hit by a bus !
I have enjoyed leave enormously, not just being with DD and seeing her grow, but also getting some perspective on my career and how I need to develop, but it's probably only in last 3/4 months that I have really felt this.
Think my husband would say that at least the first three months were really hard for him at work. He never did a night feed but he couldn't help be disturbed if DD had a bad night (even in the spare room), there is little catching up at weekends and I really needed him home by 7, so he needed to make sure he left just after 6 each day.