I like the earilest as well. I select the earliest option for breakfast except on our last day when we usually hang out at the hotel.
I am an early bird by nature. As well getting into the parks before the crowds makes it very nice. At Animal Kingdom, the breakfast is close to the Safari ride. We were first in line after our 8am breakfast (they had us stand behind a rope before 9am- but this was not all the way back at the park entrance- we waited less than 5 minutes)
WDW transportation is sufficient to get you there on time- whether it by bus (AK) or boat, monorail, or bus (MK). The evening before an early breakfast, I stop by the front desk and double check about what time I need to get to the pick up area. You may have to wait for a few minutes, but it is always better to be a little early and it takes a couple of minutes to get into the park and to the restaurants (by the way- Tusker House is located closer to the back of AK)
The only issue we had was the time I did not check with the front desk the evening before...we had early reservations in MK. We were staying at the Wilderness Lodge. We wanted to take a boat. When we arrived, we found that the boat was heading to Fort Wilderness and there would not be another boat for a long time. EVERYONE at the dock had early meals at MK. The captain called someone and then she took us all onto MK. Many of us on the boat would have been late for a meal, and we were all super appreciative. My mom commented to my dad about how the FEMALE captain had fixed everything...