[mharroun]

I see it this way:

As a manager you are responsible for your department those responsibilities dont magically poof away because your on vacation. If you have successfully set up your team/department in a way that you can "go dark" for your time off (e.g. no need of your knowledge, and proper key teammates can step in for you to interface with other teams/departments) then great, otherwise you should expect backlash if something goes wrong.