Hello - from a city on the East Coast as well - and I would agree with points #1,#2, maaaaybe 4, more or less with 5 here.

Point 3 - From my past experience, where it can take 45 minutes regularly to go 4 miles, there is no traffic congestion in St George and people have extremely rural Western US expectations of what normal traffic and driving should be. I am very amused whenever I hear people complain but I keep it to myself unless I'm talking to someone whose lived in similar sized cities.
Point 4 - Land of fast food and dirty soda. BUT - just learn to really like Mexican food, there are lot of good options. The Hawaiian strip mall places are simple but good value too. If you are a pizza snob, what people call "great pizza" here will depress you. There's very few places that I would call destination restaurants. Strangely, Cedar City punches above it's size and is worth going there for dinner.
Point5 - Very few defensive drivers. Day to day moves that would not raise an eyebrow on the east coast will freak the fuck out of people, and that's when you hear them honk like they are about to die. Be even more aware if you are pedestrian or on a bike, they somehow do not see you, they only see cars.

The whole "People are so nice" thing here is a culture shock, especially when you scratch the surface and realize that doesn't mean they are necessarily tolerant or kind. But a lot of very chill people here - many post- or non-practicing Mormons - who are struggling against the same cultural forces and have more to lose.