I have played TD for four years and, as most of you know, have been very involved since last year. But this is the first time I volunteered and I wanted to share my experiences in case you are considering volunteering as well.
I was a part-time volunteer and was assigned one 7-hour shift in the training room (Underdark Combat) and another 7-hour shift in combat room #5 (Underdark Puzzle). As far as I understand it is unusual for me to be a combat DM for my first volunteer year, but I did express interest in it, was willing to thoroughly prep well ahead of GenCon, and have shown a thorough knowledge of the rules of the game. I'm also quick at doing math in my head which helped.
Before I get into my thoughts, if you went through either of my rooms while I was volunteering I'd love to hear feedback on my performance, either posted here on via PM. I always appreciate constructive criticism.
Now, the highlights:
1) It was cool to help out, see behind the scenes a bit, etc.
2) It was cool to meet and help out new players.
3) It scratched some of the TD itch without me having to spend money on a run.
4) It will really make me more aware and appreciative of the volunteers that help me out on my runs.
5) It was a fun challenge, fast-paced, etc, and I learned a lot.
6) I had the group of GeekDad columnists go through my DM room.
7) I had a lot of fun messing with the players if they killed off my monster too quickly.
8) Really makes me appreciate the value of arriving 30min early for the run AND bringing a pre-built character.
And the lowlights:
1) I ignored the advice to wear comfortable shoes but it was more exhausting than I expected, especially as combat DM. My math skills weren't as quick by the end of the shift too
2) Training was a bit light and rushed, but I was not the norm (two different volunteer activities, newbie, AND on the Golden Ticket run).
3) In the training room when experienced players literally talked over me when trying to teach the new players, or added in excessive detail, or gave out incorrect information.