I suspect that it is you who are becoming more proficient at keeping the crud out of the camera. I have had few problems with my K10D, and only had to blow dust out a few times. I have a sensor clean kit, and have never needed to use it.
I am also. One thing is changing lenses. I dont change as much as I used to and when I do I do it very quickly and always indoors away from carpet if possible. That helps keep out a lot of the irritating specs that use to show up in some of my pics. But like you I have not had to clean mine in a while either which makes me happy also.