Oh mah lawd

do they....do they like pray at the wall every morning when they come in for work??

Well, Valve's office and the like has tons of stuff that the guys from Penny Arcade thought would shoot them. (for those who aren't aware, Valve has replicas of the turrets from Portal 2 in their office.) and tons of Team Fortress 2 stuff. It isn't uncommon for established and much more wealthy gaming studios to have stuff like the very thing Bethesda put on their wall.
Imagine how Portal 2 addicted employees of Valve go near the turret replicas at work. Blizzard has to have a no sneaking in WoW and Starcraft sessions policy.
That reminds me. I remember reading an interview in a magazine(I believe it was the reboot of Electronic Gaming Monthly) that had Todd being interviewed and the ending question was, "Do you play the games you make?"
Todd pretends he doesn't then the interviewer points out the fact that he is playing Oblivion. This was before Skyrim was released, obviously.