It would be interesting to see their body language in private ... to me, William always looks like he's fairly racing to get away from the cameras when we see pictures of them out and about -- maybe she does have trouble catching up with him in those cases!
I believe he is 6ft 3in. I am a full 12 inches shorter than my other half and he normally waits for me to catch him up, somewhere along the road or in his club (when I am intent on a little shopping)!I think that's the case as well. William is about 6'2", I believe? My husband is 7.5 inches taller than I am, and we just can't go for walks together. He's an energetic walker; and, try as I might, I can't keep up with him. I tell him that everyone who sees us walking together will think that we've had a fight or that he's a Saudi prince (which is a private joke, because he looks very, very British Isles-ish).
Although some people are cutting back on holidays in the recession, many more are not. Friends who let holiday homes up here have not had any reductions and flights to some destinations are already fully booked. Why should William or Kate stop taking holidays?
What next, no new clothes, no new car, no champagne. 'We' don't know how much they are allegedly paying or even if they are the only two going. 1000s of people will still be taking their lavish holidays are they also meant to feel guilty because they can afford their break and others can't? 
The government is encouraging people to spend so you could look on it as William and Kate doing their bit to help the Airline and Tourist industry.
