We took our 2 and 4 year old kids to the GF last month and I found the food offerings alone worth the cost of concierge!
Every morning my husband would load up a tray with breakfast stuff and we'd eat up in the room--it was great for our kids because they can't handle 3 meals a day in a restaurant. It was a nice way to start off the day. We did character lunches instead of breakfasts, which we liked better!
Also, one night we blew off our dinner reservation since we ate so much that day--and the kids had plenty to choose from with the concierge offerings (that night it was peanut butter sandwiches and mini-hot dogs), plus all of the fruit and cut-up veggies they offer, it was a great and healthy meal for the kids. They also liked the desserts!
For me, the peace of mind knowing we could feed them at any time without a hassle, or having to make a grocery stop (I hate grocery shopping at home, why would I want to do it for vacation?!) to have snack items or breakfast items on hand. They also provided a gallon of whole milk for our room so we wouldn't have to go downstairs to fill up the 2 yr old's bottle.
We didn't use any of their special services, like itinerary planning (please, they didn't even contact us before our trip, I can't imagine what they could have 'helped' with) or help with Priority Seatings--but we did find access to the food totally worth it, ESPECIALLY for the kids!