The site (databaseanswers) is neat and I've gotten some good ideas from it in the past, but most of the models (that I've looked at anyway) are pretty simple and you almost really wouldn't need to look at a diagram drawn by somebody else to intuitively put something like that together. It seems almost more for someone creating MS Access level applications. Granted there may be some more complex schemas that I didn't see.
There might be an argument about excessive normalization in some cases also. Take some of those layouts too far and try to extend them and you might wind up with tons of little tables. Normalization was I think more important back in those days (not that it's not still important... but some of the downsides of going overboard on normalization have become apparent I think.... at least to me).