Great tips!
We've done LL twice now. Once when DD was about 5-6 (and fairly short) and last year she went with her Girl Scout Troop. The girls were 10-11. Both times we had a good time. Last time we were there in mid-April, on a Sunday. Not Spring break.
Yes, there is definitely a lack of rides for the short kids. And they are slow loading.
I haven't been there during the summer but I hear it can get really crowded. If it's hot skip the Sky Cruiser ride. The line gets incredibly long. You have to pedal up high in the sky, where it's really hot and sunny.
Also, personally, I would skip Lost Kingdom Adventure. Supposed to be like Indy but it was pretty lame. Nearby is Pharoahs's Revenge where the kid's shot foam balls at everyone. Kids love doing this.
The Dragon (coaster) is pretty cool. The first time we went it was the first coaster DD ever rode. She loved it!
Loved the Safari Trek, both times. The Coasterasaurus is pretty good. It's fairly short but you get to go around twice. They have a dino dig area similar to the one at AK but you have to pay to use their tools.

.
The Royal Joist is pretty cool. DD liked it both times.
The Fairy Tale Brook is a nice place to take a break during the heat of the day. A slow moving boat that takes you past many of your favorite fairy tale characters. Nicely shaded.
When it's hot the Pirate area is a great place to go. Watch where you stand though. You can get wet from those on the rides. The dragon swing is pretty fun.
The girls enjoyed the Volvo Driving school. We went on pretty early in the day and the line was short. They did it several times and were proud of getting their "licenses"!
The Knight's Tournament is really cool! It's a virtual type coaster-you get to pick your intensity. Lines can get really long here.
There's an area where kids can get wet. Bring change of clothes if you don't want them walking around wet. I like water shoes.
Food-
While they say you can't bring food/drink in, and I believed them, you can. After we ate at Restorante Brickolini (we've eaten here both times and they have very good pizza) I took our leftovers to the car (and ice chest) I brought back in my Diet Coke and some snacks. They don't do a bag check (at least I've never had one).
Knight's Table BBQ-we checked this place out and it looked very good. We decided we weren't hungry for lunch yet so we kept moving (though I still took pix)
Snack-
We had Granny's Apple Fries last time and they were delish!
Parking.
When we went last April we get there fairly early and were able to park close the center of the parking lot. Only a short walk to the entrance.
Ambience.
They've done a great job with decor and landscaping in the park. The trees are all mature and the
Lego Village is truly amazing!
Here's some pix from our last trip. Hope you have a good time.
Volvo driving school. Girls got their licenses!
We find this old guy everywhere! Last time DTD in Florida
Apple fries
Some of the decor.
Entrance to the Dragon
Funny restroom sign
Entrance to Knight's Tournament
Intensity sign
On Knight's Tournament
Pizzas at Ristorante Brickolini
Kid's meal sign-IMHO not a good deal. Just split an adult serving.
Pizza
Adult Fettucini, side of bread sticks. We shared pizza, pasta, and breadsticks between myself, DD11, and my DM. We had leftovers.
Safari zebra
Safari Ride
Coastersaurus entrance
Dino dig sign-extra charge
Pharaoh's Revenge
Inside Revenge
DD in front of Lego Village. I took a picture of her here 5 years before.
Dragon Swing
Royal Joust
Lego White House