Break it down to what you're going to get (that you actually want) for the $70 upgrade, on average, per day.
Does the refillable mug have any value to you? (To me, it's a minimal value, as there is no shortage of beverages on the plan, and since you can only use it at the resort.. but if you drink tons of soda, it can have value).
Do you plan on using most of the snacks?
Turning to the meals.... You were already getting 1 table meal, which was either a buffet, or entree + dessert.
Now, you get to add an appetizer -- Does that have any value to you, or you really don't care about the appetizer?
And you previously got a CS meal per day... For 2 people, that's $20-$30 in value. Now, you will likely to a TS meal instead of that CS meal. What's the extra value of the TS meal? (Depends how you use it... if you use it at LeCellier, can be $100+ in value, use it at Liberty Tree Taven, and the value may just be $50)
If you would just be using it for some medium priced lunches, and you don't really need the extra appetizers, then it's probably not worth it.
If you're adding a couple signature meals, want to have some appetizers, plan on using some of the extra snacks, and maybe eating 3 regular meals per day at times... then it is probably well worth the price.