I ditto you on it's never early enough to start planning....
I'm right behind you going 1 month later in early June of 08 and I've been planning for over a year too, first with the time period and now non-stop since we got back from this year's beach vacation. I'm excited too now that the 08 rates are out and we can book our vacation.
I think you'll love going in May, that's when we went in 05, and had really great weather and not huge-huge crowds, especially on eve EMH.
We are staying at the Poly this time and can't wait. I ditto the excitement as I read through your posts.
I'm all about pre-planning out each day too, and deciding the order of how to go through the parks, that way you're not standing there for 20 minutes deciding which way to go. I recommend pacing yourself though since this is your DH and DD first time, take the time to take it all in and feel the magic. Always take the time for characters and lots of pictures.
Just to warn you, (though it may not be this way anymore), but because of the mid day show at MK you cannot walk through the castle anymore, the stage blocks it, at least that is how it was with Cinderbration, but I believe they are changing the show to some new MM one. I know I was so disappointed with that back in 05.
As far as your ADR, I recommend going to Chef Mickey's at the CR, it is such a blast! Also our new favorite find at MK is Columbia Harbor House a CS place. It has alot of seafood choices, but we sat upstairs and it was practically empty up there, it was such a nice peaceful break.
Another highlight, very unexpected suprise was doing the Family Tour at MK it lasted about 2 hours and was just so awesome. I don't want to give away the ending (don't want to spoil the magic) but I HIGHLY recommend it!
Our DD #2 was 2 1/2 when were there in 05 and she napped pretty good in her stroller except the last 3 days of our trip I think she just had enough, our other diz kids then 6 (twins) did really well, we planned on taking breaks each day, but it just didn't work out that well or seem too practical with the bus travel, but use them if you need them, it's no fun anymore when you have a cranky child...
This time because we'll be at the Poly we are planning on breaks and pacing ourselves better because our youngest #4 will be 18 mo and just recently our DS was diagonised with ADHD and Aspergers disorder and we just don't know how his days will go.
I'll keep checking your planning and I'd love to hear about the BC, we ate at the Character bfast at Cape May back in '94 and just loved looking around that resort.
Happy planning and check out my PTR too.
Here's the link if I did it right, otherwise it's called 08 will be great at the poly...
http://www.disboards.com/showthread.php?t=1540090
. This was their first trip to WDW and we were selected to have private meeting with Cinderella by a CM when we walked throught the front gate of MK. Talk about magical
I am ready!!!! 
The BC looks wonderful. I have never actually stayed there but I have walked around the resort.
With the new Dulx Dinning Plan that we decided to book we have done some tweaking to our Dinning plan... here is the lastest...
It's about a 2 hour excursion throughout the WHOLE MK with a terrific ending! You're on a mission or a quest from the Big Cheese himself with a very nice tour guide and some other Disney families. Be prepared to get invloved and have a TON of FUN! Check it out, it's really one of the only true family tours there that includes the under 15 crowd, really any age, even our then 2 1/2 yr old loved it. And it really is reasonably priced too.
