Do people there shrug off the risk? Or does it feel like they are generally aware of and have planned for it?

There's not really any risk worth worrying about, there is no imminent eruption coming. Its not even a given that it will have a major eruption again. If it does start erupting, we're most likely going to know its imminent well ahead of time (earthquakes, smaller eruptions, etc).

In Yellowstone's case, the timescales involved are hundreds of thousands of years or more, where margins of error dwarf human lifetimes.