LL is like the GREATEST. PLACE. EVER....if you are under the age of 5. And it's pretty cool if you are under 10 or so.
My kids don't even like Legos and they love it. We have chosen to go to San Diego and do Legoland and Seaworld several years in a row as our family vacay and skip DLR all together just because we feel like the whole DLR thing is so much more enjoyable for the kids when they are aged 4+. I know many of you here would disagree, but it works for us to delay the gratification for all!
After two solo big brother trips to DL (when he was 4 and 5), we are FINALLY headed to
Disneyland in May with both boys (a fractured trip nonetheless)...first three days big bro (now age 8) and me with my BF and her two big kids, then Dad and little bro (now age 4) show up on day four and we will do a family vacation for the next three together. So me and the big bro get the full week at DLR! Woo hoo!
The big kid rides at Legoland are fun, but I think they have been put in over the years to assuage the big brothers and sisters that get "drug along" to the kiddie park with smaller family members...it's not an end to a means. If you only have 10+ aged kids, and no littles, I wouldn't bother. After several trips there with my kids, I think I'm done with it even if they aren't!! It's not that big. You can definitely bang it out in one day.
That being said, they seem to always be expanding the park, so who knows, maybe someday it will be more "fun for all ages"...I agree, if you have never seen a Miniland anywhere you've got to see it once. Each consecutive time it becomes less amazing, but the first time, you are totally blown away at these "cities" built with Legos.