Yah it’s terrible there too, and what it looks like is happening is people are coming on to property via Osceola pkwy then cuttingg up to buena Vista to get across to western way. It’s normal now for the left turn onto BVD from world drive to back all the way up onto Osceola. Orlando has a traffic problem which is turning into a traffic problem for Disney as people cut through property to try to get around it. I think western way was approved to become three lanes each way though?
It all comes down to I-4, specifically I-4 west of 535/Daryl Carter down to Hwy 27 (Davenport/Haines City). The GPS apps are essential, even for locals, if you want to avoid traffic, and they direct motorists onto, in many cases, one lane roads that were never meant to handle even a fraction of the traffic they now handle. These roads include Old Lake Wilson, Sherberth, 17/92, Poicinana Blvd, Griffen, Avalon, and of course the on property roads leading out to 429 you mentioned, Western Way and Buena Vista Drive. World Drive gets hit with this problem too, as folks try to head southbound to 192 to go to Old Lake Wilson. All of these roads are inundated with motorists who, if not for the mess that is I-4 between Disney and Hwy 27, would be on I-4, and they simply cannot handle that kind of volume.
Luckily, most of the aforementioned stretch of I-4 is actively being expanded and will be done in the next few years, and hopefully with that more resilient, the pressure on these "shortcuts" will be reduced/eliminated.
That said, I do think that Western Way and Buena Vista Drive out to Flamingo Crossings will have to be reconfigured/expanded regardless, as the Horizon West area is growing rapidly.