My one trip to Worlds so far, 2006, was a blast.
My wife - Tonja, myself, and 3 other players from the Denver area, 1 PTO (Ronton), another LL (Coldfire64), and Tyler, all went.
Tonja and I volunteered for Day 1, while Ron, Chris, and Tyler all played in the grinder.
I continued to work through the weekend, Tonja, Ron, and Tyler played in the Leagues and Prereleases. Chris went to the beach.
We all had a great time and all brought back some wonderful stories of the weekend. Everyone but me made some great trades, some good friends all over the world - that they still talk with, and lots of stuff from the events they played in.
I can home with sore feet and lots of new friends as well, since I worked with the Staff all weekend. The last day of the event, 5 of the volunteers - myself included, got the best story of the weekend. Dave and Pete fired us as volunteers and promoted us to Staff members. That is by far my best memory of the event.
My advice - take comfy shoes.