Yes, the common and wrong perception. 'How do they see you down there?'
Back in the days pre 2008 when I rode uprights, a recumbent bike and a recumbent trike. I was always shocked when I got back on an upright after one of the 'bents by the close passes DFs get every day. It's the WTF? factor. (Translation of WTF is not work safe but available by pm if you can't work it out!)
Drivers see you on a recumbent because you stand out. Many people have never seen one so react to you with more caution and consideration. The effect in the real world is drivers holding back rather than passing close in a narrow situation as they perceive you as much wider than a bike. In fact the difference is a couple of inches at most, on a bike my shoulders are the widest part of the bike, on the trike the wheels and mirrors stick out a little further than me.