The thing is, I think that without shit hot childcare, with two parents working full time (especially as most job these days expect you to put way more than the 9-5 hours of the past in), the people that come bottom of the pile are the children.
Every family I know with more than one child under the age of 12 where both parents work in full on, full time jobs, have extremely hands on grandparents for school pick ups, sick days etc, or a nanny, where the parents can be confident their children are in a comfortable, consistent loving environment when they get home from school, childminder etc.
I work part time in a low paying job, (as most women I know do, rather than full time SAHM) as as a family, we cannot juggle and afford the various cobbled together childcare that would be needed for us both to work in full on jobs. My kids would have very little consistency, and we have no back up if kids are off sick etc.
I think my children benefit from having one of us available to them most of the time, and it is far less stressful for us all than two have two of us working full time.
If we could go back to the days where you weren't expected to be at your desk still at 7pm having been there since 8am that morning, and would be home with your family by 5.30/6pm, then actually it would be easier to have two full time working parents.
The only way I could work in a similar level job to my husband would be to have a full time live in nanny, which we have neither the space or would be able to afford anyway.
So back to one of us working in a 'lesser' job it is. Or we both work in less full-on, full time jobs which allow us to share pick ups from childcare, take equal time off when the children are ill, and both of our careers and earning power take a hit.