^Meh, you could catch a glimpse of the road if you looked at just the right time and a car was driving past, but it really wasn't until they started putting the truly big rides in that the "rule" got away from them. Buzzsaw Falls was necessarily tall, though there wasn't as much built up around the area at the time.
But the "rule" had more to do with when you are walking around the park than being on rides anyway. It goes back to the overall effort to do more than the basics to craft a very special theme and atmosphere that you can't get anywhere else. I don't think there are any real issues with this though. Being able to catch a glimpse outside the park isn't the worst thing in the world. If there was a motel 6 smack up against the park then it might be an issue.
And in any case, you can through all the old "rules" from Miss Mary out the window anyway. That ship has sailed - they aren't trying to be that park anymore. At this point I just look for the ways they still go above and beyond and try to be happy about it.