Reading Fuji's and stik's posts above brought it home to me. Yes I get cranky if I don't fly when I'm home.
Worse the crankyness can be minimised by going to the hangar and doing a bit of window polishing (try getting me to do that in LNS Towers) or checking the tyre pressures or cleaning the bugs/crap off the underside of the tail feathers that I forgot the last time I aviated.
I can't imagine (well OK I can but I don't like it

) not having the freedom that flying brings me.
I think it was summed up by taking a girl from work,when I had an IMC and a fully kitted out Aerobat, flying one summer evening.
She'd never flown before (even in big tin tubes) and hadn't even been in a car with me before.
It was a lovely summer Suffolk evening as we climbed up though a thin layer of cloud to see the sun setting richly, making the clouds glow a deep wonderful pink. She actually gasped with the delight of it all and commented that she'd never seen me looking so relaxed yet so focused before (says a lot for my work life). It took someone else's observation to turn my sight back on myself to realise why I love flying so much. Oh yes and the fact I love throwing fivers on the fire!!!