These aren't just 2016 tips, these are every year tips:
If one member of your party isn't having fun, its ok to scrap everything and leave the park. Yes, you paid a lot of money for that ticket. Yes, the parks are only open for so many hours a day, but if one member of your party is just over it, if they are tired, cranky, hungry, over-stimulated, or whatever, (*side eyes to my husband*), its much better in the long run for everyone to call it a day, rather than push them any farther. I've seen so many families walking around that just look miserable, (sorry Gentlemen, but it's usually Dads that are barking at their wives and children). It IS an expensive vacation, but its way too much money to just walk around and be miserable. Know when to say "when". And parents, recognize when your kids have had enough, please. I've sat through dinners next to families with multiple children where one child may be good to go, but the other, (usually the toddler/pre-schooler), is just DONE, and everyone around them can see it....and hear it. Split up if you have to, but don't push your little ones past their capacity. You will suffer for it, and in turn, the people around you suffer for it as well. Don't ruin my dinner too, please.
Along with the above, there are other things that you can do to save your sanity if things are going south. Take a cab. Or an Uber. Seriously, your day can go from bad to worse very quickly if Disney is having transportation hiccups. Quite frankly, transportation can be so bad on a regular basis it can turn a positive day into a negative any day of the week, or time of year. If you are in a hurry to get somewhere, take a cab. If someone in your group is having a meltdown, take a cab. Sometimes the only way to salvage a day is to remove yourself from crowds and lines and noise as quickly and efficiently as possible.
To echo what everyone else is saying about slowing down, I couldn't agree more. Take some time to just hang out at your resort while you are at it! Let's be real, unless you are staying at a value resort you are likely paying a small fortune to be there, you may as well take advantage of what they have to offer! One afternoon a couple of trips ago we skipped the parks and rented bikes at Fort Wilderness. We spent the whole afternoon just riding all over the property. We stopped and sat on the beach, we got some treats, we stopped in the Mercantile shops, and we said hello to everyone we passed. My 13 year old still says that was one of the best times that she's ever had at Disney. She talks about it all of the time, two years later. I'm looking forward to doing that again.