Thanks!
I have spreadsheets of our timed bus research, showing the bus number, destination, and arrival time of every bus, at selected resorts. Somewhere between 1,500 and 2,000 samples over the past 24 months, I think.
Here's a link to our 2016 edition data. Each tab is a separate resort. Where we visited the same resort on multiple days, there's an column showing which entry is for which day.
Here's our bus data for the 2015 edition too. Similar format. I'll get the 2014 edition data if anyone's interested.
In general, the average time you have to wait in the morning for a bus to a theme park, seems to be getting lower in many resorts. It's well under 15 minutes in many places, and 11 or 12 in some situations. There are still instances where you'll get a 35- to 45-minute gap, but those are rare (and the extremes seem to be down).