I can sort of get what
@wdisney9000 is saying. DHS does have some nice spots to just sit and absorb atmosphere and people watch. I think all the Disney parks excell at this, actually, and it's one of those intangible things that make them better than other parks.
IoA is a great park (and my favorite non-Disney park, though I really like BG Williamsburg too) but in terms of good places to sit and have a drink and/or snack, it does lack. Most eating spots aren't great to just sit and take in the surroundings, and a lot of quiet spots are often completely out of the way or hidden. Basically you end up with a choice between crowded with lousy atmosphere, or a quiet spot that's so quiet it also lacks atmosphere. I do think Uni has more spots that are enjoyable to just sit and absorb atmosphere, but then you're stuck in Uni, which isn't as nice a park as IoA IMO.
We're going to have to disagree on Six Flags, though! DHS is still nicer than my local SF.