I understand the difficulty all too well about disconnecting during vacation.  I am actually responding to this post during my vacation.

Although I haven't responded to more than 2 to 3 "work" emails during the week, I've been keeping my finger on the pulse by monitoring my inbox.  I know that's not healthy, but as you demonstrate so well - it's difficult not to do.

One of the best vacations I have taken, however, was an Alaskan cruise where there was no Internet, except in port.  I was unable to monitor and the funny thing was, nothing bad ever happened.