I was at Disney World for it's 20th and 25th Anniversary. I don't remember the park/resorts being more crowded (we always go in September). The marketing materials were changed to reflect the anniversary. I still have bags and park brochures from both anniversaries and I have more stuff from the 25th anniversary than the 20th celebration
. I am looking forward to going again this year in September. My husband and I will be celebrating our 21st wedding anniversary, my 40th high school graduation, my husband's 40th college graduation from the Unversity of South Carolina and of course Disney's 40th Anniversary - I plan on celebrating every minute......