No that is not the point. When a cycle lane is put in for your safety why not use it? Another thing there are a lot of pot holes in roads, surely a nice smooth surface would be preferable.
When it's safer, most of us do. Often it's not. It's not safer if it hugs the left and you want to go straight on or turn right at the next junction. It's not if it's too narrow and encourages close passes. Are you talking about cycle lanes (on road) or cycle paths (off road)? On road cycle lanes are better, but still have the above problems. Cycle paths are worse; not swept like the roads are, randomly wandering pedestrians, more conflict points with other traffic (e.g. on passing side-roads), convoluted routes...