I used to commute occasionally on an ICE B2, until I sold it.
I found I was given more room by general car drivers, as they didn't know what I was until the overtook me. A few children would shout 'cool bike' at me. The B2 is quite high up, and like Pete, I was at eye level with drivers, so not so low down as to become 'invisible'.
When I climbed slowly the bike would wobble from side to side with each pedal stroke which would give me a slightly 'nervy' look and I attributed this to drivers giving ma slightly more room, as I assume they thought I was a new cyclist and more likely to wobble into their path.
Dave C