I'm a parent and I, too, wish there were some adult-only options -- better yet, I wish all of the table service restaurants would all switch to "12-and-over only" for all ADRs after, say, 7:00pm. Small children heading in to have dinner after that point are going to be there past their bedtime, after which their behavior and attitude degenerates quickly and relentlessly... which ruins the meal for them, their family, and anyone else in close proximity.
I never want my kids to be "those kids," so we plan ahead carefully to make sure they are not only well-versed in restaurant etiquette, but well-rested enough to apply those manners cheerfully and consistently. At WDW, daily naps and dining at a reasonable hour are absolutely key to making that happen!