At 4-way stops I find myself incredibly frustrated at the lack of roundabouts in the US since the traffic moves so much more slowly. But for high traffic intersections traffic lights are just more efficient since they let more cars through on average.

I think much of the issue is that by solving it at one intersection you simply move the problem to the next intersection. I'm pretty sure putting a roundabout at the 280/Page Mill Road intersection would improve throughput but nobody would get to work any quicker since the choke point is the next intersection along.