Yes,
Free Dining is usually the better discount for families with several children. So as long as the dining plan isn't forcing you to eat in a way that you wouldn't normally eat or may not take full advantage of, it's probably the right deal for your family.
The DDP doesn't work for our family because we just don't eat enough food and don't need an alcoholic beverage with every meal to get the full value out of it. We also don't like being tied down to eating at a certain place at a certain time. For us, if the free dining plan offered is the DDP as opposed to the QSDP, we'd probably take the room/package discount instead (or I would schedule a few 2-credit meals so we'd only be tied down to reservations a few time rather than every day). That being said I know we're the exception rather than the rule and that most people are thrilled to get the DDP for free. You've done the math and know it's a good value for your family and probably the best discount available for your trip. So take advantage of it and enjoy it!
And good luck on being "done" with Disney.

We took our 2 oldest children back in 2001 and figured we'd make 1 more trip when the "littles" were a little older (they were 1 & 2 at the time of the first trip so they stayed home with grandma and auntie as the older kids were 10 & 12 at the time and the trip was a "reward" for them.). So we went back in 2004 but since I was pg on that trip, we knew we'd have to make one more trip for the new baby. Yeah, we've made 8 more trips since then -- not because we had more kids, just because we wanted to.

And I have no doubt we'll make a bunch more because all of the "kids" (youngest is in college now) love Disney and we go as an extended family every 2 years. I don't think we'll ever be "done" with Disney.