One thing has bothered me about the arrangement of the bridge on the various Star Trek series. The entrance to the bridge is positioned in such a way that it is behind most of the seats and workstations.
I admit that it is fairly unlikely for intruders to be able to reach the bridge without warning, and of the ones who could, many have the ability to beam or transport directly there. Nevertheless, it is theoretically possible for a hostile boarding party to surprise the bridge crew.
From a security standpoint, it would be preferable for the entrance to be as close to the viewscreen as possible. Doing so would give the bridge crew a little bit more of a fighting chance.