yehudayona
“doorways, by the bookcase where the siddurim are, in the hallway that leads to the bathroom”
They have no business being there. Additionally people have no business davening in aisles. One may only Daven at an official “spot” an aisle is not a spot. You cant just “pull up” anywhere and drop a shemoneh esrei. Halachically you may walk in front of such people and even lift them up and move them out of the way. But its best to try not to start a fist fight in shul.