I never minded, I would talk with the customers, be friendly. Made them ask for me when they came back, which is always a plus.
I also never minded explaining what I was doing, which seemed to help.
I've had total jerks who would glare at you the whole time, but I just figured it went with the territory.
Now I watch if I have to have something done, but I am always friendly, smiling.
I've been invited out on the floor lots of times, by mechanics that don't even know me, even ended up handing guys tools after we get to know each other.
I approach it as a professional would, understanding the guy is working, doing a job as fast as he can, and I don't slow them down or interrupt with questions. Helps that I know what they are doing, of course.
When having some recall work done I printed out a sheet of what needed to be done from the TSB then left it on the seat, since I could not watch the job at that dealership.
When I picked up the vehicle the mechanic had used my notes, marked each thing off and added a couple little notes back to me.
You better believe I gave him a nice feedback when the dealership called me.