Most of those comments and threads about one zoom vs multiple zooms or primes are very person specific where they may benefit very much from a super zoom. But it does not apply to everyone including, but not excluding, travel photography. In my experience the time spent on changing only two zooms is minimal in a casual situation such as a vacation, but if you are getting paid to get the shot than a super zoom might be more suitible. I say might because sometimes there are other qualities such as IQ or lowlight capability which will trump "getting the shot" because your client might be not happy with the result, or yourself. If you get a two zoom setup you can have a constant f/2.8 from 17mm to 200mmm vs the variable aperture of f/3.5 to f/5.6, thats a huge difference. And the IQ is better.
John.