We went in early Dec. 2004 hoping for a fun server and we waited over an hour (with a PS) for this, and our server was automatically boring and did not joke around with us at all. It was to this day the only truly bad experience I've ever had with Disney dining. I had gone in 2002 and also hoped for a fun person and got a boring person who ignored me. At least in 2002, they brought the food out while it was warm.
So I'm sure you can request a low key person. They seem to have quite a few of them.
I never complain about restaurants at WDW, but this is the one place I will probably never try again.