Or possibly the opposite Taz - my husband travel to Ireland and Germany regularly for work and it drives him nuts being out of touch which he's traveling (which is one reason he likes to go to Ireland by ferry, as he has internet on the crossing). If he was going long-haul I think he's have a melt-down!
If he's traveling for pleasure, he doesn't have his work 'devices' switched on.
The only objection I'd have to wifi on aeroplanes is it's just one more way people can drive me insane with their constant key-board thumping, button clicking, key-tone beeping or (god help us) Skyping!!! Turn the beeps off people, and type quietly (better still - use a tablet!!).