Yes, the bottom line is, if the patron is over 9-yo they are suppose to only offer a double portion kids meal at double the price. Mac n Cheese for example is $8.49 So the non-child double portion would be $16.98 or roughly about half the price of most the main entrees on the menu. The Monte Cristo Sandwich is the cheapest non-kids choice at $26.95 currently and most people say it is plenty filling enough to split/share. For those that are very frugal it is wiser to just share the sandwich rather than pay the $12 split charge which only gets you one salad or cup of gumbo. So you can figure a family of 4 will shell out around $90 for lunch (including tip) if the adults share the Monte Cristo and the kids are over 9 and get the double portion kids meals. Here's the menu:
https://disneyland.disney.go.com/dining/disneyland/blue-bayou-restaurant/menus/ Disney now has "Mickey Check" kids meals which is an indicator for dumb parents with fat children what's the healthiest things on the menu. Personally, I might order a double portion of the Salmon for myself as opposed to the Monte Cristo and get a healthier meal and save $9.