Considering the overwhelming number of sloth drivers out there, I don't think that's true. Today I was stuck behind a sloth driver. Older mistubishi product. Guy drove it like he couldn't operate a manual transmission, or maybe the clutch or the trans was going. Anyway, this guy was really holding me up with his slow acceleration and pace, traffic was thick and the queues at each light long, but this guy wouldn't keep up. But anyway I digress. I was stuck waiting behind this guy, just moving maybe 10mph.
Oh, I was riding my cannondale at the time... that's a bicycle, Galt. After the mitsu driver turned off the road, I sped up to 30mph and was *pbutting* automotive traffic in the left lane.
I can't think of any time I delayed traffic more than the average driver around here does rutinely. Not once. I can't think of a time where legally riding bicyclists have delayed me while I was driving.
Thusly, if you are being delayed, my guess is that you simply lack driving skills or spend a huge amount of time on crowded, narrow two lane roads that attract a lot of bicyclists. I have a difficult time such roads exist.