I think this depends on the photographer and what he/she shoots.  I am much more of a believer in prime lenses rather than zoom.  For the amateur I think the recommendation is spot on.

Additionally you need to ascertain how you are using your equipment.  My 70-200mm f2.8 zoom is a pretty heavy lens.  I'm not certain the average person would lug that around, although compared to an 300mm f2.8 it is pretty light.  I have a number of macro lenses, the 60mm is a good choice for light weight and is a prime, but I prefer the 105mm especially when traveling, with a tele-extender it becomes a ~200mm at far less bulk and weight as the 200mm f4 macro, but I normally chose the lens for what I'm shooting or the concept that I plan to shoot, that goes for the camera as well.  I rarely just go out looking to see what I can find, usually I've decided the subject, general idea, and lenses I need for the shoot before I leave home. I agree that a prime makes the photographer move more, but moving around the subject can often lead you to that really special shot.