The BEST family tour we ever did was with Abercrombie & Kent to Australia. There were only five other families with us. We had one guide but she took care of us like family--she even went out and bought us all hats when one night at Uluru was predicted to be cold!
We started in Sydney, went up to the Great Barrier Reef (Hayman Island), then on to Port Douglas and the rain forrest, then to the red centre for two nights at Uluru in the outback before heading back to Sydney for the return.
They had amazing activities--surfing lessons, a sea plane trip over the Reef to go snorkeling, an astronomer to do a talk on the southern night sky, etc.
I would travel with them in a heartbeat.
We also did Japan with Tauck--it was a great trip but there were considerably more people on the tour and we definitely felt better taken care of with A&K.
I think ABD is pricing themselves out of the family market, especially to those trips that you could easily do a much cheaper way (e.g. Ireland, England).