Despite what the website says, park transportation begins running approximately 1 hour before posted Early Entry opening. For FW that might be just the bus to MK, with the boat starting later. Hopefully someone will come to clarify!
To be near the front of the crowd entering any given park for EE, the recommendation is to be at transportation (bus stop or boat dock, whichever will run) 90 minutes before posted EE opening time. Yes, that means if EE is 7:30, be at the transportation pickup spot at 6:00 if you want to be near the front of crowds entering MK!