I'll try not to feel defensive here. As I said last time, I completely acknowledge the role of operator ignorance/error. (and BTW,when I mentioned above how I passed three ropes, I was not skiing under ropes; I was entering roped areas through open gates -- perfectly legal).
That said, I think the topic points out a fundamental difference b/w eastern and western skiing. In the east, since the trees tend to be so tight, boundaries are mostly very clear. The trails are really obvious (that would be the big white ribbon of snow in front of you) and any tree skiing is either in between runs or close by. Unless you deliberately take off into the woods away from the area, you can pretty much be assured that you'll end up at a lift. Remember, most eastern areas are 400 - 800 acres total.
In the west, if you stick to obvious groomers, it all seems similar. But if you venture off trail, things change in a hurry. There is so much terrain (Snowbasin is 3,000 acres) and it is so open that it's much harder to assess if one is on a "trail". And since the areas are so big and so complicated in terrain, it's possible to ski lower than lifts serve, for instance, or follow a drainage out of bounds. In the east, I can pretty much turn off my "location awareness" for big parts of the day (especially if I can ski anything on the mountain) and always be assured of finding a lift or a lodge at the bottom. In the west, not necessarily. And, as 4ster pointed out, there is a MUCH more vibrant back-country ski culture. One could follow tracks out of bounds, as he observes.
I completely understand how I need to upgrade my awareness to an area, and at all three areas I skied in Utah, I sought out and spoke to patrollers about terrain/access. Nonetheless, I still found the profusion of ropes in the Sisters area of Snowbasin confusing and I was still anxious about whether I would ski below the bottom of a lift. And, speaking to a patroller didn't always completely help -- for instance at Brighton, I skied into an area which a patroller said was open side-country, but ended up having to skate/pole through deep snow for several hundred feet because it dropped into a flat meadow (could he have warned me about that while he was suggesting it?). Originally, I said I thought some ski area boundaries are not obviously marked or explained, and I'll stick to that observation -- at least for some of us eastern skiers brought up on almost impermeable boundaries.