Where are the AAA Diamond parking lots at the theme parks? Do they fill up fast? Are they really that convenient?

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1972, Orlando Campground; 1988-94, Orlando-area resident (frequent visits); 1992, PO; 1993, Dolphin; 1996, WL; 1996, D.Inst.; 1997, BW Inn; April 2001, Wild. Home; Nov. 2001, BWV & OKW