WDW has been our family's favorite vacation destination (2 kids, and one trip with the in-laws, also). Chef Mickey's for breakfast has become a family tradition. We've always had fun there! Kids aren't big breakfast eaters, so we're just paying for the experience. That said, we go in knowing there will be a crowd, we might have to wait a little bit for each character, and we have FUN! We still take pictures and videos (our next trip is this summer, and the kids will be 18 and 22), they'll still reminisce about being there as little kids, and it may not live up to a 5-star dining experience (personally, I like the food - scrambled eggs, bacon, grits-yes I'm a northerner that eats grits, breakfast potatoes and fruit), but we're going to have a great time! The food will get us through until lunch time and you never know when one of those magical moments will happen.
With a dozen trips, a good estimate of time spent (always on Disney property) would be about 80-90 days. And with that many meals eaten at the parks, resorts, Downtown Disney and water parks, the ONLY bad experience was a waitress at Rainforest Café (Downtown) in 2012 - completely ignored the birthday request for my daughter (I was probably more disappointed than my daughter, because that dining selection was hers for her birthday). So, we have a nearly 100% positive review for Disney Dining.
Have a great trip - the one trip with the in-laws we had was perfect. Enjoy, go with a positive attitude, rest when you (or the kids) need to, and you're going to have a great trip! Guaranteed.