Perhaps there's a difference depending on what time of the year one visits. Admittedly, we strategize and choose weeks of the year with lower crowd levels. All of our more recent visits have been during weeks that were rated in the top 10 on the "Your First Visit" site (e.g., early October, early May).
The buses are what they need to be, clean and reliable. Like any other city, efficiency is affected by how many people are using it. Last time we visited during Christmas, we may have had to wait 15-20 minutes to get onto a bus (I personally thought the dispatching was off as we would get 2-3 Epcot or AK buses for every MK bus). Leaving the parks, considering the mobs was handled about as efficiently as possible. You're always going to have situations of guests refusing to move to the rear to accommodate other guest, hyper kids and such......just go with it.
Not a transportation expert, but I don't know of a more efficient and cost effective way to transport tens of thousands of people daily around an area covering 6000 - 7000 acres. Until we have perfected teleporting a la Star Trek, I think we will be stuck with some method of mass transit.
Disney buses are certainly nicer and more efficient than what Universal has implemented.
However, what's with the music on the buses going to/from Disney Springs? We were there this past weekend for MNSSHP and the music on the bus was the most annoying I've heard.
Register on WDWMAGIC. This sidebar will go away, and you'll see fewer ads.