I can't sleep this morning, so I've had random starport thoughts instead.
1) The Champa starport (written by LKW) in JTAS is interesting, the terminal buildings are in the centre, surrounded by a 3m high berm, and the circular landing bays are on the outside of that.. presumably they need no blast walls though. In fact in such a situation large flat aprons would do just fine. Monorails ferry cargo and passengers to the berm, through it or along it.
2) Different types of bay determined by a) duration of stay, and b) type of cargo. Shuttles (both ones destined for the high port, destined for other moons or planets in the system; or those from passenger ships waiting in orbit, such as yachts and subsidized liners) require only a few hours at a gate, much like a jet. At big starports they could taxi to the gate at the terminal.
Longer stay ships such as scouts, PCs adventuring ships, free traders, mercenary ships, safari ships, anything streamlined with mixed or containerized cargo, could land at more distant pads that they hire for the week. Because they are in residence, and numerous, they need to be away from the busy terminal. Transport to a berth can be by personal transport (air/raft, ATV, taxi, etc), by foot or by grav bus. For BIG ships and those with nonstandard cargos, such as dry bulk (grains etc) and liquid bulk (liquid chemicals) the high port is the way to go, pulling up alongside specialized tanking or off-loading equipment. But a large downport may also have a separate area dedicated to bulk cargos, dry and liquid.
Here's a sketch of what this long-stay berthing might look like:
And this is one of those bulk transport 1000+ ton berths on the perimeter.
Airports are my thing, though, so my knowledge of docks and ports is a bit more sparse.