Scoobydooby reminds me of something I think all should keep in mind when evaluating the plans (and cost effectiveness) for their family. Is it saving you money THE WAY YOU WANT TO EAT? It's much easier to say 'yes, it will save me money if I use it to it's fullest' - but personally, I virtually never get dessert with a CS meal (I think my sister and I did once, which was a complementary one, on her birthday) - and I only eat dessert at TS about half the time. For me to have the regular dining plan save me money, I would have to change the way I eat. I'm not willing to do that.
Now, for some, the ease of being able to 'not worry about the money' and have everything pre-paid has a non-monetary value, and for others, the dining plan doesn't change the way they eat. If you fall into that group, I say go-for-it. (And pre-teens and under 3s really do change the monetary calculation, too - so you have to look at it for YOUR family!)
I know if I got the free dining plan, and didn't have another room discount available to me, I'd still not change the way I ate, and I would not get full monetary value from that free plan. I was brought up to 'clean my plate' - so you can bet those desserts wouldn't be making it onto my tray!
And to the OP -- if you do want to do TS for all your dining credits, I recommend getting ADRs for everything ASAP. During free dining promotions, the restaurants do fill up disproportionally to the actual number of people in the parks, and you're going to have to be super flexible to be able to do TS for everything without ADRs. (And by super flexible I mean eating at off times and going to resorts for some meals, and that's going to cut into your touring time - plus if I have a late lunch, I sure don't want an early dinner!)