In reference to the "ropes on 4th class" comments. I think it's common for folks to do the "4th class" routes on 14ers (i.e. North Maroon, Little Bear, Capitol, etc.) and think they are pros at the grade. In my experience, the standard 4th class 14ers are quite soft for the rating. I think this sets people up to receive a shock and feel sandbagged when they get on other routes of the same grade. Once you get on some more sustained 4th class routes (even in CO), it becomes a bit more apparent where a rope would have its place in the hands of a knowledgeable party. Here are just a few that come to mind. These are all 4th class, and all spots where a fall would be disastrous. Even experienced people occasionally use ropes on 4th class...
Little Matterhorn, RMNP - This is the final 4th class to the summit.
Little Pawnee, IPW - This is the initial downclimb toward Pawnee Peak.
The Hammerhead, Flatirons - Exposed and steep 4th class to the summit.
Lone Eagle, IPW - Exposed terrain to get to the summit.