My family and I stayed at the Swan from December 26 - January 2. We used the bus transportation to get to AK and MK. We took the bus to MK once and AK twice. We took the return bus from AK both times. We were going to DS for lunch on our MK day, so we did not take a return bus from MK. We also took the bus to DS once from the Swan. I believe the buses start running around 45 minutes before park opening.
I really liked the Mears Transportation. We have stayed at various Disney resorts and this transportation was just as good. In some ways it was better. If a bus was picking up for a park and could not fit everyone on, the driver would radio for a back-up bus to pick up at the resort. Mears actually had back-up buses standing by for overflow. Some of the buses were tour buses. One morning when a tour bus picked up, he said he could take 24 passengers. It is easy to distance in these buses. When the smaller buses picked up, they would fill all the seats but no one could be standing. There are no social distancing dividers. This did not bother me. You are not on the bus that long and everyone was wearing a mask.
I know most posters on this board are recommending that everyone should walk to YC or BW to take the MK bus. If you have to wait on a second bus to come because the first one was full, you could be waiting a long time. We took the Mears bus to MK on December 30. When we arrived at the TTC there was not a line for the ferry so we walked right on. We arrived to the TTC around 7:45 a.m. with a 7:00 a.m. opening.
For AK, you are dropped off at where all the other off property resort shuttles are dropped off. It is a short walk from the gate and there is covered seating at the stop.
For DS, we took the bus to Springs and it drops off behind Cirque building. We did take a return buses back to YC and BW. The Disney resort bus stop was closer to where we were when leaving.
Once we arrive our car is parked and does not move until checkout day. We really enjoyed the transportation that Mears provided. My husband and I are going back to stay at the Swan in February and we will use the Mears transportation provided by the Swan again.