I agree, and judging from the many rolling stops they undertake, so do drivers. When any vehicle has to come to a complete stop for absolutely nothing, they're just putting wear on their brakes and wasting energy. I'm happy to see 4-way stops (which people are terrible at) being replaced by more roundabouts. A roundabout features the desired intersection rules without having to wait for the state to enact Idaho-style bike laws.

As a cyclist, I'm in a very good position to assess how empty an intersection is: no windows isolating me in a sound bubble; low speed, so not much wind noise in my ears or tire noise on the ground; no A pillars obscuring my vision ahead; and my eyes are usually about as high off the ground as those of an SUV driver.

Motorists will tend to be in a worse position for assessing the emptiness of an intersection, and their vehicle is much more dangerous, so the onus to slow down is greater, but coming to a complete stop is often unnecessary. Slowing down to make sure there really is nothing there is sensible.

If I were on a recumbent bicycle, or in a little sports car, I'd have to be more cautious when approaching an intersection because my eyes are lower, and farther back from the front of the vehicle. (I hate riding recumbents in the city, but they're pretty awesome on long distance rides).