For us the SOG transportation worked well when going to the four main parks. Just make sure you know the schedule. When we went they had two bus routes. One went to the TTC about every twenty minutes. The other went to Blizzard Beach, AK, & MGM,but this bus ran on an hourly schedule. If the schedule says they depart MGM at 40 minutes after the hour and you show up at the bus location at 45 minutes after the hour you will have to wait about 55 minutes for the next bus.
Besides knowing the schedule you have to know where the buses pick-up at BB,AK, & MGM. In the past the SOG bus did not pick up where the Disney buses do at AK & MGM, can't remember about BB. The very first time we went to AK we went there via the Disney bus, when we were ready to leave we went to the Disney bus pick-up area and never found a SOG bus, later learned the SOG bus arrives in a different area. If we had rode the SOG bus there to start with we would have know the exact location.
We have occasionaly walked over to the Poly and caught the monorail to MK but usually prefer to take the SOG bus.
But, in the afternoon I like taking the small boat that runs from MK directly to the Poly, buy a cool beverage from the bar near the pool and enjoy it as you walk to SOG.
I did find it a pain to get to Downtown Disney, you have to get the TTC and then catch a Disney bus. Just seems to take forever and the Disney bus going there was often crowded.
Overall I give the SOG buses an A rating, the drivers were always very friendly too.
I'm interested in seeing how it works when they re-open.
Enjoy your trip,
Ty