I have Asperger's Syndrome. It's pretty easy to give advice
lol the last time i went was in '06. I was 17 at the time and scared to death of riding the Twilight Zone "Tower of Terror" (mainly because of my phobia of high places) so I opted out of going on it. But I did go on Aerosmith's "Rockin' Roller Coaster" (Big Mistake!
) As I don't like being upside down and am prone to bad haedaches and possibly seizures. this ride also had loud noises and flashing lights blaring in the riders' ears (which scared the daylights out of me!) I went on this ride twice. Once in '06 and once in '04. But Epcot has some good rides (spaceship Earth and Journey Into Imagination to name a couple.) Plus there's Disney Quest at Downtown Disney when you need a break from the parks! I think at Epcot you can catch a ride on a boat and sail to for a while to just to enjoy the view from the water (this may be a bad idea since your child is sensitive around big crowds...'tis a small boat) I would advise also to ask the cast member at the ticket booth where you first come in or maybe at your hotel if riding the monorail would be a good idea for your child because of the movement of the tram he/she may get bored and want to move around and you could lose track of him/her (unless he/she paces in circles i know someone in college who does this or if he/she rocks back and forth you may want to give him/her something to do to ease his/her boredom while on the monorail...and during the wait to get on!)
As far as character free food goes, there is a restaurant in Frontierland called Pacos Bill Tall Tale Inn and Cafe, the menu has no character-themed food.
I copied their kids' menu for you:
Kids Picks
For Guests 9 and Under
All meals include choice of two side items: grapes, applesauce
Choice of: 1% Mickey Milk, small bottled water or apple juice
Chocolate Chip Cookie, Fries or Soft Drink available on request
Hamburger $4.49
Mixed Greens Salad with Chicken $4.49 Chocolate Pudding $1.19
(p.s. i know one of the drink items says 'Mickey milk' but if your child is still upset, you can always choose something else)
I have also posted a link that contains menus for the different disney restaurants so u guys have an idea of where to eat on the days you're there:
I hope this helps anyone with an autistic child and to anyone planning a trip to WDW in '09...have a safe trip!

oh yeah i should mention one more thing about the character meals (or meeting characters in general.) if you have any Disney character stuffed toys or those Disney Princess dolls lying around your house I suggest practicing with your child, Watching Disney movies also helps too. Give yourself and the child a 'Disney day' before the big trip arrives.