Greetings in that Divine and Most Precious Name of Our Lord and Savior Jesus Christ!
In my parish we don't elevate the Bishops seat when HGs comes to visit with us, but we still have a revered Throne-chair for them and further when they are with us sitting anywhere we lay out silk and embroidered fabrics which we also use for the Altar. Further, the canopy is always brought out like it is for the Gospel and the Holy Communion. The Bishops traditionally are the living Apostles, and we revere them as almost Living Saints who carry that Grace of God in them and share it with us best as they are able. When we revere them, it is not exactly personal (though sometimes if folks are close enough in a paternal relationship it is
)as much as spiritual. We acknowledge that God is working through the Bishops, and so we revere them as we do the Icons, not to worship the people themselves but the Grace of God which flows through their actions and persons.
[ Lord have Mercy on HH soul ]
The Throne of the Bishop comes to symbolize the Throne of the Apostles which in reality is like an extension of the Dominions and Powers of the Angels.