Exactly, Problem here is Orlando has 'Lifestylers' whereas Anaheim has hard core fans who don't have a problem calling out Disney when the fans feel Disney is not doing things properly.
DLR has its own core audience of... disturbing folks. There are plenty of people that the CMs all know and talk about. There are plenty of people that go there all the time and are just as addicted. Check out the crowds that line up for any LE merchandise event.. or people that wait 8hrs just to ride Star Tours.
DLR folks are far more fickle and far more willing to complain at City Hall. And I don't mean that is a nice way.. but in a self-centered, 'are you serious?', kind of way over the stuff people will complain about there and demand compensation.
The real difference is the folks in Cali think DL is *THEIR* park.. not Disney's. The difference is having 2-3 generations who have grown up with the park as a part of their family traditions and lifestyle. DL was always available as the 'lets goto the park tomorrow' and you just went. It's scope made it much more accessible and as you say.. the size of the population base helps.
Contrast that with Orlando.. where WDW has always been this 'vacation' destination that is set off by itself.. almost stand-off'ish. WDW has been much more about a place for people to work... than a place for people to just hang out. DLR was the 'local mall' for so many kids.. where they blew off hours every week just goofing off. WDW has never had that kind of demographic. The scale of the place, the customer base, the accessibility, etc.
The difference in generations and how people visited the parks really alters the type of attachment people form. I also think the sheer scale of WDW overwhelms people who try to be that hawk watching how things are done and trying to be a critical voice.
Add on top of that all the nostalagia angle that the DLR folks are so found of.. armed with the history of Walt.. and the fans there take 'their' park far more seriously.
The idea of growing up (literally) with the park... vs 'visiting the park every year' is a huge difference. Plus, the visiting demographics of frequent visitors (with the cheap AP programs of the last ~20 years) was so different between the parks.
It's easy for locals to hit DL up for 3hrs after work.. there is a lot more overhead to do the same at WDW. Little factors like that make a difference in the grand scheme..