We committed even more sacrilege - we took our girls to DLR for the first time ever - and went to DCA first! Our first day was a Tuesday, but one of our group hadn't arrived yet, so we had decided not to use our MM until Thursday. So, we had planned on heading to DL first, meeting a few characters maybe and then heading to DCA. However, it ended up pouring rain, we left our ponchos in the truck that the valets had parked the night before (and we had to wait until a parking spot cleared up before we had them bring it back). All this took a while and we wound up doing DCA first - and ended up just spending the whole day there. My girls didn't get their first steps in Disneyland until the next day!
They survived and didn't feel deprived.