Hopefully 11m skip will pick up slowly over the next few years--it is now legal to communicate beyond 150 miles on CB. There are frequent openings where channels 30+ are active with skip conversations, mostly in LSB, even now, but there are seasonal variations on how often this happens. Someone here noted channel 38 is a good indicator of propagation openings, it can be pretty popular with DXers.
CB thrives in many rural areas, and it is an important safety measure on many USFS logging roads, which have the proper channel posted. As trucks come down the grade, they announce that they are coming because the roads are narrow and they are hauling big weight under the influence of gravity. They are trying to get out as many loads a day as possible, and logging trucks careening down a mountain road are best encountered when you are expecting them--or better yet safely off the road.
Some old CB radios and some easily erected antennas would have been a godsend to isolated villages in Puerto Rico after the hurricane devastation. Arguably, they had a more robust communications capability in the 1980's during the CB craze. Message handling and routing, however, would have been problematic though, but it beats no communication at all.