When I'm flying with a guy who writes everything down I have two thoughts:
1. Great, this guys won't miss anything, and
2. Great, this guy is makeing us look retarded by missing calls.
My point is use common sense. When Ground says, "taxi to runway 2 via Alfa" they sort of expect a response within 2 or 3 seconds. When you take 10 seconds to write it down they end up coming back with, "xyz, how copy?"
As to you regional guys, most all of you are hub and spoke. The big airport is the hub and the small airports with easy taxi routes are outside. After a few months on the job the "hub" should be second nature. The outstations should be VERY simple routes. Nobody is getting, "taxi to 25C via T8, T, R3, C, YY, Z" at an outstation.
Wanna write it down? Fine, I'm not gonna stop you. But for the love of God please respond with, "Taxi to Runway 27 via Alfa" within a couple seconds or we both look stupid.
Disclaimer: There are two of us and I would never move the plane unless we were both sure of where we were supposed to be going. If either of us have any doubt I stop and we querry ATC. I'm just saying please respond first to simple taxi clearances and then write it down. If it's long and drawn out (you can foresee that instance by a quick look at the airport diagram) then please do write it down on your little sheet of paper on the yoke clip or the FMS scratchpad or whatever.
As always, Fly Safe.