I grew up reading Don's comics, and my D.U.C.K. book is so worn that it doesn't have a cover anymore. Hell, in my old room I still have his (wonderfully and finely detailed, as usual) Duck genealogical tree poster. Despite all this, I knew nothing about the man himself, which - judging from this heartfelt article - is as good and intelligent as his comics. It's sad to see he stopped writing, mostly because there's no one there to fill his gap -- and it's a huge gap, as huge as those left by Floyd Gottfredson and Carl Barks.
I also own every duck book he ever released. I grew up with his and Carl Barks' comics. I still enjoy them.
Btw, Don Rosa and Carl Barks are almost like national heroes in Finland where I grew up. When Carl Barks visited the country, there were people on the streets celebrating. Don Rosa's visits are also a big thing.
Here's a video from 1994 when Carl Barks had his first visit in Helsinki. The streets were full of people celebrating. He was kind of a rock star in the country.