If you were planning a day that looked like this…
Would you drive yourself everywhere (leaving the car at the Poly while at MK) or rely on bus/Lyft?
*ETA: I know my meal times are tight. 
Yes. I really love having a car, especially on days with multiple parks/resorts.
Yes drive
Another vote for drive. We always have our car at WDW and almost always drive to the parks/resorts everyday, unless we are walking distance from a park.
I am adding another drive vote.
Well, that makes for an easy decision then! 
It’s the first time in the history of the Forum that there has been a unanimous decision!
