I am frequently reminded that one difference between a shade tree home mechanic like me, and a real professional bike mechanic, is that the former can do quality work on a task, but the latter can do quality work on that task quickly, get it right the first time, and while fielding customer questions.
Our receptionist rides a Bikes Direct single speed to work. Her brakes weren't working well, so she brought the bike to my house this morning. As she waited I replaced her brake pads, adjusted them close to the rims, trued the rims so the pads wouldn't be rubbing, removed the brake cables and housing, fixed cable friction problems that had the both brakes binding (according to her, both bikes she's bought from Bikes Direct had this problem), and rewrapped her bars. All simple stuff that I'd do perfectly on my own bike but that I would normally take one or two painstaking hours to do. Since she was waiting I did it fast, in half an hour.
The result was fine on brakes, I'm kind of proud of that - her brakes were crap, now they are very good - but a sloppy tape job. Embarrassingly sloppy.
She doesn't care. The bike is just transportation to her. But I'm going to sneak down to the bike room at work sometime and rewrap her bars.
Are there examples of this in your own experience?. (Asking primarily those of you who are not professional mechanics, as I realize many of you are in fact pros).