Most are but I would say Califormia Grill, Le Cellier, Chefs de France, those types of places may not have some kid friendly items on their menus and the overall atmosphere isn't laid back and welcoming in the eyes of a child. You shouldn't have a problem finding tons of places your whole family can eat and enjoy.
Um, all the places you listed have 'kids' menus - at least for those considered kids in Disney's eyes: kids nine and under.
I agree, if your kids are picky eaters, some adult menus may be too exotic for kids 10 and up. Then again, I've also heard some adults who feel this way. Though I think on the whole WDW does an amazing job of offering a few (somewhat) unique choices and some very main stream choices in most of it's restaurants.
I also know that if you ask nicely, some places will lets older kids have an adult sized portion of child menu item - like chicken nuggets, or will allow a substitution of say french fries for a baked potato provided they already serve it.
Buffets are almost always a good option for kids because they will have some 'plain food' options, as well as more adult items to sample.
I also agree that kids should learn how to dine nicely, and the way to do that is to take them out to eat. I think of any place on the planet, WDW is perfect for this. When you go to WDW, well, it's not like you can leave the kids at home to eat dinner. You can hire a baby sitter, but the kids will still need to eat, so it's not a reaistic option for most families. WDW was made for family vacataions, so it's a great plce to teach our kids how to do fine dining, in a somewhat more understanding environment than you might get outside of WDW.
My one other suggestion is that you work within the limits of your children. If you plan on starting your days two hours before their normal wake up time, then a 9:30 pm dinner might be out. On the flip, if your kids have a nice long afternoon nap, a 9:30pm dinner might be fine for them. If they are getting low blood sugar waiting for an ADR, give them a snack before dinner. If the weather is particularly uncooperative, it might be best not to drag them halfway across property.