I haven't read the whole thread as I'm sure it's the usual bunfight and judgements. Do what is right for you - from your original post, it sounds as though you have built up a solid pension so far, and if you and your husband are on the same page about it, it works really well.
I had a professional career, big salary and London job, but I also had four children - by the time my 4th came along, I was doing everything badly, so gave up my (paid) job, and became a SAHM - for about 10 years, until my youngest was in Y5 ish. I volunteered during my time at home, including setting up a Free School, and did various PTA/charity type things to keep my brain active and my CV peppered with 'stuff'.
I am now working 2 part time jobs, both of which are very different, both of which I really enjoy, and I get the best of both worlds - being around at the beginning and end of the school day when they need you (even if the teens deny they do - they do!), and also earning some money for myself and saving a little bit. Luckily DH earns very well and has a solid pension life insurance and redundancy package, (and being brutally honest, my inheritance will be quite chunky), so we do have financial security, but it is REALLY important to communicate with each other about the expectations you both have of each other if you give up work.
I do wish that I have more in my pension pot, and there are days when you just want to throw something at the wall and ask yourself what on earth you thought you were doing - BUT they are with you for such a short time (my eldest just turned 18 and I don't feel that it's been 18 years since he arrived!), so if you have the opportunity, then I would take it.