Although water landings may sound like a good idea, and though star and space ships are air-tight, to float a such a ship would require that they follow the standard bouyancy displacement rules.
That is, to float 1 ton of ship, you have to displace 1 ton of water (or whatever liquid is predominant on the planet). There's also the issue of stability of the floating ship (i.e., keeping it right-side-up). A lot of the ship designs (with the exception of most of the small crafts) would have a problem with stability, likely leading to the ship listing, and that's just from the existing design.
Factor in cargos that are rarely uniformly distributed across the hold, unusual ship profiles, and that most passengers would not be impressed having to be ferried ashore, I can see most decent starports would have hard landing surfaces.
As for wheels, well, a "light" 747 jumbo jet weighs empty and dry 377,000 lbs (171 tonnes). The "heaviest" 747, fully loaded with passengers and fuel, weighs about 921,000 lbs (~418 tonnes). Granted, they have to wheel around on reinforced concrete runways, but wheel/hydraulic tech existed to support these jets during the '60s, '70s, '80s and '90s. Imagine what the tech would be like down the road.
IMTU, all ships that are streamlined and were built at a TL capable of supporting a-grav only have big landing foot plates. If they need to be taxied around the field, the ships are powered up so they become gravity neutral, and the utility vehicles pull it to wherever it's suppose to go. TLs under that, they have wheels (sometimes LOTS of wheels) and landing plates.