I would agree that someone making 120k and having a family with 3! children would have health insurance anyway.
However lets not forget that some people make good money specifically because they are consultants, and do not get insurance from work, but have to buy it themselves.
I believe I pay about same as you for family coverage, but I think employer puts up more than than for me (they keep complaining in order to have us aware of their expenses I guess).
I don't think 20k is unbelievable for a family of 5, if you don't have group coverage. It's probably somewhere there - don't forget we get discounts at work because it's a whole group of people.