I'm pretty boring when it comes to above ground constructions. I tend to start on the most flat terrain I can find and then level it to make space for apartment blocks and other buildings. I tend to build in a small grid pattern, with 3x3 bedrooms arrayed in 2x5 rows in a single building that's usually 2 levels tall. Sometimes I build paved roads between buildings. I'll build a curtain wall around it all eventually, but early on that usually means that I have to deal with snatchers in open ground, which really sucks.
Ultimately that ends up meaning that it doesn't look so different from underground forts, though it's certainly possible to build flowing neighborhoods that follow the terrain. Above ground constructions take long enough to do as it is, so I just take the simplest approach instead of doing that. It would be really nice if we had better building planning tools, but that's something that we probably shouldn't wait for.