I tend to agree with you though I didn't get rained on. It was 90 degrees and no shade waiting for a bus that was way behind schedule. I don't believe it is a high expectation for a major bus hub like DTD to have a covered bus loop queue area for both rain and sun shelter.
Disney is not some third rate amusement park, it is a high end resort. Bus shelters are not a cutting edge and would have reasonable expectations that Architects would design shelter to major hubs in the 21st century given the climate of Central Florida.
I am not one to blame the guest and justify Disney building the cheapest builds they possibly can. What is next
Florida is hot, guests know that, put screens on the resort guest windows and not have A/C in the rooms. If it happened some would blame the guests for expecting A/C in Florida.
And a perfect example of cheerleading for Disney building on the cheap and blaming the guests. Turn what you said around a bit, how about, Deluxe and moderate bus stops are covered why not the value resorts? MK, Epcot and Animal Kingdom's mega bus loops ARE covered why not the Studios? Disney just opted for a poor cheap design for the bus loop at the Studios and DTD. Given WDW resort is a high end experience I anticipate more not less!