I have been fortunate to arrive at OSH via almost all of the published procesures - the standard arrival over FISK, the warbird arrival, and the NORDO (no radio) procedure. I will suggest that for a first timer, picking your time is really important. My first arrival was NORDO. I intentionally spent the night at Fon du Lac and launched at 7AM since that is when OSH opens and my guess was that I would beat the rush. My arrival was a non-event as there was only one other airplane visible in the pattern. Fast forward a few years and I had the experience of flying an afternoon Warbird arrival in the middle of a formation of 20 and a Beech Baron decided to cut in behind me uninvited. Fortunately my tail end charlie guy called a warning on the radio and I/we were able work around the idiot.
I will agree that based on my arrivals under all sorts of conditions, it is uncommon for things to get out of hand. The ATC guys do a GREAT job. The flip side is that if you are not used to seeing other airplanes in relatively close proximity, it looks like a big fur ball. Calmness is a great asset. If you have other seats in the airplane, bringing friends to be extra eyes is good in many dimensions. And you can always go around, find your way back to Ripon, and try again.
Go back next year and it should be much easier.
Best of luck,
Wes
N78PS