I don't think my daughter - or indeed any of her peers - are "incarcerated or ignored from 8am to 6pm 5 days a week" (*mental image of a Romanian Orphanage*
) Most of the parents seem to put the kids in from 7.30-8 till 3.30-4, and I don't know of a single one who does five days a week (my daughter does 4). I'd say a far bigger problem is the parents who leave their kids with the grandparents, because they can't afford the ripoff fees: the vast majority of kids at my daughter's nursery are left with a grandparent at least one day a week. A friend of my wife took her son out of the works nursery and now leaves him with her parents five days a week - so his daily routine revolves around Countdown and Deal or No Deal. This can't be doing him any good.
As you no doubt know, there is only so much attention you can give a small child before you tell them to bugger off and play nicely. At nursery, my daughter gets the attention of a keyworker during the day, a childloving bint whose sole raison d'etre is to lookafter kids and entertain them with organised activities appropriate for their age, and when she comes home - and at the weekend - she gets our "quality time" (for want of a better phrase) too. And, better still, we keep our sanity and a roof over our heads.
I would certainly accept there is a certain amount of variability between nurseries, but if you get a good one I reckon it's a lot better for kids than getting under mum's feet.
YVMV