I don't think ordering dessert and drinks is ordering nothing. It will still set you back. And its your vacation, you have a reservation, you are paying, you have as much right to be there as people ordering $200 bottles of wine.
You will decrease the tip for the server by doing dessert only (so I'm sure they like the wine tables better, LOL, but its all part of the job). If they are worth their salt (like I said before) they won't say anything. CG has some great desserts. So I still say go for it if thats all you want. Perhaps this could serve as a stepping stone to introduce your kids to more sophisticated dining. They can look around and see all the yummy food going to the other tabls and maybe next time will want to branch out to more than dessert.
Which brings me to another good reason to keep your ADR. Maybe your klids will get up there, see the food and decide it looks good after all. Like I said, some of those descriptions are no help. You need to see it. Enjoy!