My previous posts were about design aesthetics, but since "Disney is a business..."
Marketing, in general, spends an awful lot of time and money researching the psychology of everything related to their products and selling environment. From the colors used in the brand logo, the placement of an item on a shelf, layout and decor of the stores etc. Here's a link, not meant for reading, but to indicate just one of the ways Marketing researches stuff.
http://www.emeraldinsight.com/doi/abs/10.1108/00251740610673332 Disney knows a couple of tricks, REALLY well...nostalgia sells, the emotional proud parent watching their kid, that sells.
On a basic level comfort matters. So if someone is too hot or too cold, you don't get the right environment for maximum sales and satisfaction. I kept hearing that the "new Peter Pan queue is really good," but when I went through it, all my husband and I felt was that the corridors felt so small, and closed in, and despite not normally having a problem with enclosed spaces, we felt like the queue was claustrophobic and thank goodness it was only 9:30AM on a cool day, because we wouldn't want to be stuck there if it was any hotter or more crowded.
The Hub is so wide open, even though distance hasn't changed it feels like it takes so much longer to walk it, than it did before. This is the same thing that happened at DL when they redid the Disneyland Hotel and Downtown Disney. Many people swear that the monorail platform was moved and rebuilt, but it wasn't. But the environment changed enough that people's perception was altered.
Disney used to know these things, either through inherent knowledge and a lot of trial and error. And all that is being sacrificed for one immediate benefit. Yes, more "personal space" is nice, but if you add one positive environmental factor, but make 3 things worse, you are worse off than you were before.
Now, I don't think most guests will be able to articulate any of that, anymore than they can articulate why they like a certain brand logo over another one. But I do think it will show up in people's behavior, and stress levels when touring the park, and ultimately how willing they are to buy, or rate the enjoyment of their day. Again, big business spends a lot of resources figuring out this stuff, and I don't think Disney has given it a second thought.