What about employees smart enough to boot a laptop from a thumb drive but not smart enough to disassemble it who just want admin to install some game from a dubious source? What about other scenarios neither you or I can think of right now? The cost of activating bitlocker is so low, I'd do it just in case.
Also, I'd argue the stolen bag scenario usually features dilletante attackers.
Also, I'd argue the stolen bag scenario usually features dilletante attackers.