webray said:
I don't believe in taking babies into the park, definately not a three year old. Think about it..from his vantage point. All he looks at all day long is peoples butts, that's it. Not much fun for a child if you ask me. He can't ride the majority of the rides, and you have to plan naps, etc, taking time away from what should be a great vacation.
I have to take a stab at this and guess that you've never taken a baby into the parks. Am I right? It is very untrue that a 3-yr-old can not ride the majority of the rides. We started bringing our oldest DD at 6 mos, and she had a blast pointing at the sights, and she loved the rides. There is very little they can't ride aside from the thrill rides. DD2 came with us at 4 mos, and DD3 at 3 1/2 mos. My girls loved the playgrounds at Toontown and over by Splash Mountain as young as 16 mos and rode Goofy's Barnstormer at 3. They loved the Pooh ride, the carousel, the teacups, Dumbo and more even at 6 mos. And at 2 DD2
loved PhilharMagic. In fact, to this day, I have never seen her laugh so hard. WDW is much more magical to a child under 5. JMHO
DD1 at 18 mos
DD1 at 2 1/2
DD1 and 2 at ages 4 and 2
And finally DD3 at 15 mos
I have many, many more pics, but I don't want to hog the board with pics of my kids.

I just wanted to show you that children 3 and under do not just sit and look at butts all day.

It kills me when someone tells me they aren't going to take their kids until they are least 5. At 5, DD1 told me, "Mom, I know they're just people in costumes." Ouch! I'm glad I took her when I did.
To the OP: I would talk to your son and find out why he is so adamant about not going. Find out what he doesn't like about WDW and what he does like. Maybe he thinks you're going to make him meet the characters, and he's spooked. Maybe plan something special just for him. Will he be 4 by the time of the trip? He might enjoy Pirate Cruise at GF. Spend time playing at the little playgrounds. My kids especially like the new Pooh Playful Spot. It has a splash area which all three girls really enjoyed. There is so much for him to do there.
If you need to book right now, I would plan on taking him. As others have said, kids change so much in just a matter of months. What will you do if he changes his mind? Then you will both be upset.

I also agree with those who said to show him the planning video/dvd. Ease him into it slowly without pushing.
Just curious, how old was your DS the last time he was at WDW?