thermosflask, posters who choose to/have to leave their babies have always been very defensive on Mumsnet. I don't think it's a new thing. You are totally entitled to your views, and some posters are being quite rude to you.
While I personally consider myself very lucky not to have had to leave my babies to earn a living, I have had the honor of caring for other peoples babies, some of them for 50 hours a week. All the mothers were fine with their decision, and tbh, all the babies I cared for had loads of hugs/eye contact/warmth and are doing very well as much older children today. I totally cared about those babies, gave them as much care and attention as I would my own DC, and cried buckets when they moved on. 
It's a bit like the breast feeding/bottle feeding debate. Some babies lives would be much worse if they didn't have access to formula/their mothers didn't work.
It's a very fine balancing act.
I personally wish my mother hadn't worked when I was small (she went back to work when I was about 8 weeks) but if she hadn't, she may well have lost the plot completely, and who knows where we would have all ended up.
But, back to the OP....when I was pregnant, I totally believed I would be happy to leave my baby with anybody...how wrong I was!
Check out nurseries/childminders, etc. IME, a decent childminder will have a routing in place, and your baby will be the only child under one, allowing them to give plenty of individual attention. Possibly more than a nanny, who may get a little bored with only one baby to care for.
Surely there is no need for you to go back to work before you baby is 6 months?