I find that if I use a cover at the end of the day, the next morning I'm not wiping off dew and dealing with a surface wetness on the seats. My seats are waterproof. So that means all the dew sits on the surface. And absorbs into what you are wearing.
A cover saves time from having to wipe all this off.
Anything on my carport stays dry from the morning dew, including the Goldwing and my wife's car, where my truck in the driveway looks like it has been rained on.
I keep the Goldwing covered mainly just for rain that blows in.