Although the character meals are included in the dining plan, they aren't usually the best use of your credits - the sit-down TS restaurants usually cost more than buffets by the time you add your entree, dessert and drink. I'm not sure what restaurant the pp was referring to when he/she said Garden Grove was not included, but the Garden Grill is included in the plan.
We usually eat breakfast in our rooms (pop tarts, donuts, cereal, etc.), have a CS lunch and a TS dinner. Our family of 6 last trip (4 adults, 1 child, and 1 non-ordering infant) came out about $600 over the cost of the plan, but that was when tips were still included - I figure we will atleast break-even this trip (3 adults, 2 children) and I like the convenience of having our meals pre-paid, we can order what we want, and dh likes not having heart failure every time he sees a very high check.