There are a few food courts where you can use the TiW and get the full 20% discount without the tip added.
Even with the tip added in, it is a great. I know that you can find people who have done the math and if you use you TiW card and spend over $375 during the time you have it, that it has paid for itself.
This past June I used my TiW at POP food court (multiple times as we stayed there), 50's, Cape May, 'Ohana Breakfast, Pizzafari, and Turf Club. I would have used it as well at Crystal Palace, but had left it at 50's the night before and had to go pick it up at Lost & Found. In adding it up, even without Crystal Palace, my TiW card has already been paid for itself.
Example where even with tip, there was a savings:
Turf Club - 4 Adults (rounding up to the next $)
App - 7
Dinners - 91
Desserts - 24
Drinks - 56 (probably more like 60-65)
Total: 178 (pre discount)
Discount 20%: 35.6
Tip 18% (pre discount): 32.04
Total Bill (Total - Discount + Tip): 174.44
So as you can see, I still saved the 20% or $35.60. I will say that I did tip a bit more on top of the 18% I was charged as the waitress was excellent.
I am going again in November, solo trip this time. I do not plan to eat at as many places that the TiW discount will be used, but I still plan to eat or drink at some. So, even if the discount will only be $2-10 each time, I figure by the end of the trip, I will have saved at least $50 dollars.