We use that gray type duct for CAT5 Ethernet jumpers at the telecom company. I should know what to call it, since I have specified it on too many work orders. I guess it is because I just rely on copy and paste! 
Nowadays, we use a lot more that is yellow and doesn't have rough edges for the fiber jumpers as they are far more prevalent. It is certainly easy to add or pullout wires and fibers. I would use it on a layout near a panel where I had a lot of wires, then in the outer reaches of the layout use a cable clamp with only one screw holding it in place so I could easily make changes. My days of fishing wires in and out of closed holes while in precarious spots are done. As a former coworker said to me once, "Mark, you always hurt yourself working. I only hurt myself having fun!" 
He was still riding motocross in the "senior division" when he left our company at about age 50. 
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