Rather than take the interstate to get there, instead we took back roads.
Quite right. The "super highway" route from Great Falls to North Dakota would actually have taken longer than the two lane. The small towns we went into and the places we saw you can't see from the four lane. Actually, Glacier can't be reach directly from the highway. You have to take two lane roads to get there for quite a ways. This is probably why it is not all built up all around the park borders.
I found this to be another area of the country I need to go spend more time in at a later date. We did this sort of a swing though the southwest one year and went back for longer periods of time later on to really try and see it. A quick run like we made gives you an idea if you want to go back. I want to go back!