I've always planned trips within 60 days out, so park hours, events, crowd levels, etc were all out, which made picking park days a lot easier. How do you figure out where to make your ADRs at the 180 day mark? The crowd calendar isn't updated that far ahead, right? (i.e. How do I know which day to go to Magic Kingdom, and therefore try to get the CRT ressie?)
When they reopen to 180 days they should have the Park Calendars up then.
I wouldn't worry about which day you want to go to the Magic Kingdom, because with 4 kids 4 and under, you will probably spend a large chunk of your 11 days at the Magic Kingdom anyways. I would just plan on the Magic Kingdom on whichever day you get your CRT ADR. You may want to try to avoid a day that has extra magic hours, if you're not planning on using them, but other than that you should be fine.
With CRT there's a chance that you'll have a hard time getting any availability, so if it's a must do, then you may have to be flexible with it.
Most of your other ADRs will probably have a bit more flexibility, at least until you get closer to your trip.
I'm having the same thoughts....We'd like to see AK(never been) and MK(always a must) and will be there a Sat night and depart Tues am, so Sunday,Monday park days. How do you figure which park which day??

Is there any rhyme or reason to EMH schedules? Is there a better day to visit each park/avoid park? I'll have wait to see if park hours are released or else just fly by the seat of my pants
EMH schedules are usually pretty consistent. It's usually best to avoid parks that have Extra Magic Hours that day, unless you're planning on using them.
UG has a calendar of which parks are best on which days, but they also say that having a good touring plan is 5 times as important as which day you go, which basically means, if you get to the park at rope drop on just about every day, and get the headliners done, then you'll be able to manage crowds better. If you get there around 11am, and stand staring at the map for 10 minutes, then wander around looking at wait times, then the crowds are much less easy to handle.
Traveling May 6-16 (so I was a little worried about crowds - crowd calendars show about a 6). We'll have 4 little ones (4 and under), so we're definitely not planning on park hopping.
A 6 is a good touring day. We went in January, and our crowds were projected to be at 5s and 6s and they weren't bad at all. The best resources on touringplans.com are the Cheat Sheets, in my opinion. They allow you to look at your day, and plan based on what you want to do, and when you'll be at the parks. Their touring plans are only really helpful if you plan on doing exactly what they tell you to do; however, they're nice to look at if you plan on arriving at one of the times they mention, because they give you an idea of which rides you should hit first.
You may not want to completely rule out Park Hopping, because with that kind of a group, you'll probably need a mid-day break. It's hard to walk around Disney all day for an adult in the best shape, so for 4 small kids it can be like torture. I would recommend bringing/renting a stroller for even the eldest, especially if you're planning on getting there in the morning, then staying as long as you can.
The middle of the day is the most crowded at Disney, so we prefer making it to Rope Drop, taking a midday break, then returning to the parks in the evening (usually Magic Kingdom or Epcot, even if that's not where we were in the morning).
You may prefer getting to the parks early, staying until you get tired, then calling it a night with young kids.
It's really amazing how much more you can get done in the first hour after the park opens, than you can do during midday.