Well that's silly. In fact part of this discovery came from "seeing" shifts in the surface topography of Titan in the short time that Cassini has been orbiting Saturn.
They found sulfur volcanoes on Jupiter's moon Io, through visual observations.
They found fractured ice all over the surface of Europa, that was seen.
They found active stream gullies on Mars and ancient riverbeds by seeing them.
They found an asteroid with it's own little moon by seeing it.
They even saw a comet crash into Jupiter which left us with a whole host of new science to chew on.
Science is about discovery both visual and inferred from observation and calculation.