I scrapped everything we did and saw on our 2007 trip. I have since decided that was way to much to scrap (that book is huge). On our 2009 and upcoming trip I only scrap the major events and our favorite things, also things that are new or different since the last trip.
I also scrap things about the trip to and from Disney. (We drive)
For ideas you might consider joining an online scrapbooking club. I belong to 2, one thru yahoo groups and the other is a digital club. While I do not scrap digital, it does give me ideas (both are Disney scrapping groups).
Also I thought there was a dis scrapbook thread, you might want to check for that too.