I am very glad you mentioned this. I often worshipped with Eastern Orthodox (Orthodox Church in America) congregations many years ago, in relatively small and always pewless churches or chapels, and was always thrilled to observe how our standing posture altered the experience, and made a special demand of us for engagement. At the same time, there was always a variety of focuses of attention, given the numerous icons, which are MEANT to be looked at and visited and pondered over and addressed in prayer during the liturgy. And as you say, the priest's movement through the congregation with the censer engaged us in a special way. 

I should note, though, that in larger Orthodox churches, and perhaps by now all Greek Orthodox churches, they've assimilated to Western Christian practice, and installed pews, alas!