Like any of the dining plans, if you can find one of them that is fairly similar to the way you would normally eat on vacation I think they can all save you money. The desserts add value if you can get things to take with you to use as snacks if you don't want dessert with a particular meal. The snacks can be great if you want something to drink in the parks or extra snacks can be used to buy things to take home. What I will say, for any of the dining plans, is that if you have snacks left over but you are spending money on drinks, you may be doing yourself a disservice as far as value goes. Some will disagree with me; and this is because it is such an individual thing. If you want to maximize park time on a short trip, as the OP is trying to do, I think this is the best plan to go with, if any at all.
I am the opposite. I found TS meals too restrictive on a daily basis and prefer to pay for the few I want OOP. Again, what suits one, will not suit the next.