I have a appreciation for how far Pokemon has come, since it's beginning with red and blue. I'll give you guys an example of what I mean with Johto's Violet city. Compare the city with HG/SS's and G/S/C's lay out.
You'll see that HG/SS's Violet city is much more detailed (giving it a bit more individuality other than G/S/C coloring the town violet) and compact, while G/S/C's Violet city is huge and a bit same-looking with sharing it's building design with the other cities. It's really neat imo.
http://bulbapedia.bulbagarden.net/wiki/Violet_City
(Unable to provide an image link. Sorry.)