I have various issues with Google Maps (missing roads, old inaccurate information, etc.) but the biggest issue I have is that they don't provide elevation profiles.
You mentioned that you looked for hills, and even with the Terrain setting on it is very difficult to tell what the hills are really like. You can tell that the road goes up a hill, but is it a short steep one, or a long gradual one?
However, yes, it is nice to preview a road before you get there ... and see what it was like back in 2007.
And now that you've previewed it ... are you going to ride it this weekend to get a feel for what it is really like?