When we have early breakfast ADRs at other resorts (meaning you'll have to take one bus to another bus/monorail to get to the resort), we always take a cab. Gives us a little more time to get ready in the morning and avoids the stress if the "breakfast buses" are running late. Last year we had a 8am ADR at CRT and at 7:35 the bus had not arrived to pick us up at AKL (which is about 25 minutes from MK). We had been waiting since 6:55am. We had another bus driver call for us. He informed us that TWO buses should have been there by that time. The bus immediately came and luckily there was no traffic. We RAN to the castle, making it there about 8:05am (although technically, you are supposed to be there about 7:45am for an 8am ADR). Our saving grace was that the computers were down at CRT and they couldn't find all the ADRs so there was a ton of people waiting to check in.