Abstract, sorry the link is not working for you -- ??
The process you describe for changing lenses is exactly the way I do it, too! Get the cap loosened on the lens I am going to be putting on and then quickly remove the lens from the camera body, switch caps, slip the new lens into place....voila! I will say, though, that this is easier with smaller lenses than with some of the larger ones.....
Spicyapple, I don't think you have quite the idea of what using a digital single lens reflex camera is all about! Putting one lens on and never swapping it out rather defeats the purpose of owning/using a DSLR, wouldn't you say? I daresay that, yes, there probably are some people who moved from a P&S to say, the Nikon D50 and the 18-200mm VR lens who have never taken that lens off the camera since Day One! Too bad, as they are really missing out....
Actually, some zoom lenses are more likely to cause problems with dust than switching primes on-and-off the camera. Some of the older push-pull kinds of zoom lenses suck the dust right up....and right into the camera.
Thing of it is, dust on the sensor is really not as major an issue as it sounds to someone who has never actually used a DSLR. Basically, if the user takes the time to handle the camera body properly during lens changes and also takes a couple of extra minutes to quickly use a Giotto Rocket air blower, there should not be major issues. I've had my D70 for well over a year and my D200 since mid-December; neither has had issues with a dirty sensor, and I change my lens a lot under varying circumstances. I figure that if at some point I see signs of the need for a serious cleaning, I will take my camera in to the local shop and let them do it, as I'm not about to muck around with Pec pads and liquids and all that. My Giotto Rocket has done very well by me and my cameras so far.....
Yes, when looking for a macro lens, you've really got to go with a prime lens for the best quality.