I agree with you Mary...
I also have experienced DL too many times to count, being from LV we always went there as I was growing up. I will always have a special place in my heart for DL..I cannot put my finger on it, and a friend of mine who has been to both agreed, but there are some great qualities about DL that WDW doesn't have, and vice versa of course... All the parks have just little differences here and there to make them each exciting and unique. BUT I must admit the closeness of the two parks compared to the 4 spread out ones at WDW is the biggest difference to me. The best rides of all 4 parks (IMO) are in 2 parks within walking distance at DL.
I do not know of any guide that compares the differences between them. The only ones that I have seen are individual guides of the individual parks on their own....Since you have been to DL so many times, you can always just get a WDW guide book and then compare the info about WDW with what you already know about DL from your experiences of being there...that is what I did. We just made first trips to WDW and DLP ourselves within the last 2 years and I love looking for all the differences between the parks, and there are too many to list!!
OH! I forgot, besides the other things listed, WDW does not have the Matterhorn (WDW kinda seemed bare to me without that), Indiana Jones (a fave of mine). Toontown is set up different, Tomorrowland is really different, WDW has Winnie the Pooh ride and Philharmagic in Fantasy land, but DL has Alice in Wonderland and Storybook land (with Monstro). Pirates of the Caribbean is a condensed version...Splash Moutain is different too, but a litte longer and different storyline at WDW. The list could go on and on...
Please do not get me wrong, WDW has things that DL does not have too. We loved it so much that we are going to take another trip there when I thought our past trip was a one and only! Cannot wait to go back, and I love them both!
Have a great first trip there!