My response is based upon our experience the last week of February/early March. If you proceed as you have in past and don't watch cc charges and holds day-to-day (I don't normally do this, either!), but instead just wait until a few days (up to about five, seems to vary with credit card company) after your trip to have a look, you shouldn't notice a difference. By that point, all the holds should have fallen away and you will only see the actual charges to your credit card for the amounts charged to your room. I think those charges should appear at checkout from each resort, since none of your resort stays are greater than five days.
If you look at your credit card activity during your stay, you should see holds (my bank lists these as pending charges in my account activity) that will sum to no more than the total of the charges to your room plus $100. As you charge things to your room, Disney will place new holds on your card whenever individual charges exceed $100 or when you make a series of smaller charges that sum to more than $100. The new holds should simply equal the new charges (i.e., those not already covered by previous holds). At checkout (or every five days, for longer stays), Disney will actually charge your card for the amount owing (i.e., total room charges) to that point. When this happened during our stay, they at the same time applied essentially a negative hold to our card equal to the existing holds, so that the net in holds was zero but the actual charge was now applied.
The positive and negative holds persisted in my credit card account for about five days following checkout (which included a weekend), and then all disappeared. Because the positive and negative holds balanced each other, my available credit was not affected by this.
I found it a bit confusing to figure out the transactions when I looked at my credit card activity during and at the end of my stay, but was happy in the end with how these were done as they never tied up more than $100 of my credit beyond the actual amount of my room charges. I don't normally monitor transactions on my card day-to-day, but did so in this case because of the uncertainty around this new policy. If I look at my credit card statement now (a couple of weeks after our trip), I only see the charges at check-in (for the balance owing on our room-only reservation) and check-out (for the accumulated charges to our room over the length of our stay).
I recognize that our trip was during the first week following implementation of this new policy, so it is possible that there will be (or have already been) tweaks to the implementation.