I am an Eastern skier who has fond memories of Brighton. I think it's under-rated.
Certainly, it has a big boarder scene, although in the East we are used to big boarder and skier scenes (read: crowded) here on the weekends, during half-decent winters (not this one or last!). But I really enjoyed the trees of the Western Express and the Snake Creek Express, the powder hangs around for days after a storm in those trees becuase the boarders don'r ride much of the gladed stuff at Brighton. A big reason for that is that the terrain does, unfortunately, flatten out 2/3 of the way down the hill and you frequently do have to "walk" out the woods to the trail system. But it stays really nice in there!
Brighton is old school, which I appreciate. Just a ski area, one overnite lodge, one day lodge, some services, that's about it. As far as it being like an eastern mountain, that's true to some degree, although it CERTAINLY gets a lot more snow than we do out East. And the Milli area feels more western/open type skiing, although for whatever reason I usually found the better snow conditions on the "main face" of Brighton, for lack of a better term.
And if you;re lucky, like I was, a local will show you some backcountry stuff off the Western Express. I got knee-thigh deep stuff in the trees before fairly easily cutting back to the trail system. The local kept going, telling me it would eventually deposit him out by the general store, if I remember correctly.
You probably wouldn;t fly out to SLC just for Brighton, but it's still a really good option on wknds when the LCC areas are busy. Also a good option 2 days or more after a storm, when other areas can get tracked out