My Boss 302 stays under a cover and doesn't get started unless I absolutely have to move it out of the garage to work on another car. I have plenty of room on the other side of the garage though, so that rarely happens. I try not to lift or move the car cover at all because I'm paranoid about leaving scratches.
My fox body on the other hand gets started a few times, but that's mainly due to having to move it outside for a few hours every now and then so I could work on my daily driver when needed. My garage stays around 67 degrees all winter, so I don't have to worry about condensation too much. If I do have to start a car though, I make sure to let it get warm and give it a few revs before I shut it off so there's no water settled in the exhaust. That and I like to annoy my neighbors. Lol