I think it's the extremes that get to me. I don't mind people waiting for a parade at all. I totally get that people watching can be enjoyable. And I think it would be a lot of fun to pop into
Disneyland for an afternoon to chill out, take in the ambience, and watch a parade. If a family wants to sit on a bench and wait for a parade while chatting and eating dinner and people watching, I completely get it. It might not be my choice, but I'm okay with someone else wanting to do it.
What bothers me is when a person has an "it's all about me and my experience" attitude. I really try to ignore these behaviors while I'm vacationing at Disney, but sometimes it's difficult when it's really blatant. I don't like when arguments start about whether problems are created by AP holders or non-AP guests, or locals or out-of-area guests, or Marvel or traditional fans. I've been an AP holder and a non-AP visitor, I was a local growing up who moved out of the area and I love both Beauty and the Beast and GotG. I think these behaviors can happen with all these groups.
I think people who tend to be kind and considerate of others just can't understand when other people don't behave this way in return. For me, this problem isn't about the nice family who sits for two hours chatting and laughing while eating an ice cream cone on the curb as they wait for the parade in their favorite spot. This type of family is likely to move over to let a visiting family with a 2 year old have a better view and chat with the parents about the best way to get a good view at Frozen.
The acts which caused nice families like this to have to change how they spend their time are people who spread out 15 blankets while leaving one person to guard their "territory" or people who form a blockade of ECVs, strollers and backpacks that caus even more crowding along an already jam-packed Main Street. These "blanket hoarders" aren't the only inconsiderate people to visit the parks by any means. They are kissing cousins to the people who elbow to a prime WOC viewing spot at the last minute, use flash photography during the Bayou section of PotC, and "join" their family by pushing through 100 people in line.
Unfortunately, these inconsiderate people may have spoiled it for the families who were not abusing the system that was previously allowed. I for one am relieved that I may not have to make the stressful decision of how much time to devote to getting a "good" spot.