For the pro anglers, bright lines are not an issue as they almost always tie on a clear leader. So do most of us serious weekend anglers, I suspect.
I use a "weightless" wacky worm presentation, and it requires fluorocarbon line to ensure that it overcomes the surface tension that braid and mono lines normally encounter. I can actually watch the clear fluorocarbon as it gets pulled under. On another rig, I use only a fluoro leader, this tied to a bright yellow Sufix 832 braid. I'd make sure the leader is long enough to get the light presentation down, but this would be a way to go if you have trouble seeing straight clear line.
For me, it is a bit more about the sinking rate of lines than their colors. The second issue with lines for me would be their diameters. The smaller the better for the job to be done.