we, too, are a food allergy family and found the absolute best lunch of our past 8 trips was at the Plaza in MK... the CMs were outstanding! the chef came out, chatted w/ds, asked what he realllllly wanted and then found a way to make it all happen... he tracked down some nut free brownies, opened new containers of ice cream to avoid any cross-contamination, and made him the most amazing dessert of our entire trip (desserts are mostly off limits for ds)...
that being said, we have had dinner at LTT w/no problems, and an awesome young female chef (amber?) took good care of ds and kept him safe... but the service paled in comparison to the Plaza where ds was made to feel super-special instead of super-deprived...