I use a mix of road / cycle lane and the mix varies almost on a daily basis. It's not just the quality of the cycle lane, but the time of day, volume of traffic and even the weather that influence my decision which to use. There are some parts of my route where, even as a reasonably experienced and confident rider, I feel very vulnerable on the road, especially when traffic volumes are high. Other parts I feel safer on the road due to, as said above, pedestrians and driveway entrances.
I do get slightly irritated by cyclists who insist on always using the road even when there is a very good cycle lane available.