We got upgraded to a 1 bedroom suite once and did NOT have access to concierge, and we got upgraded to pretty much the same room another time when we had booked concierge.
There were only 2 bathrooms, so you definitely have the 2 bedroom. EXCITING!!!!!!!
I liked concierge. They have a nice espresso machine that basically makes cappucinos (they use pods, it's fairly simple). I love having the option for nice fresh fruit in the morning without having to pay something like $7 for it, so for me that fruit is a big perk.

Others enjoy the muffins and other things they have.
Of course, concierge is what you make of it. You can get the most for your buck by staying near the hotel pretty much all day. Get there for all the food times (breakfast, lunch-ish snack, beer/wine time, dinnertime, desserttime), take some time to watch the movies you can check out (the suites and concierge rooms have DVD players), etc. Of course that's hard to do with those great parks right there!
With the number of people in your family, and I'm fairly certain you guys are omnivores with no food allergies, concierge would almost certainly be worth it even if you aren't always in the lounge. The ability to take Uncrustables and waters and coffee and all the other stuff they have, with no restrictions, would be absolutely beneficial. Our restrictions and teensy family-size, it's hard to get to that "absolute" point of benefits.
