I think if you spend enough time in the wilderness that you will inevitably run into circumstances in which you will have to fall back on your survival knowledge to overcome some problem you didnt foresee. Weather changes, equipment fails, you mess up at some point, or expected conditions turn out to be different.
Personally I cant stand camping around other people. That pushes me into areas that are hard to get into. People dont go there for the simple fact that they are difficult places to camp. If you mess up out there then you are pretty much on your own.
I have had a few trips where I have had to use some of my skills. Most of my trips to the bush are survival trips in the intentional sense. I cant say that Ive ever been in a situation where my actual life was at stake (yet). Most of the time it is a matter of pushing on and not pitching in the towel.
Some experiences
PA: It was March, and unseasonably warm. We decided to go camping and due to the perfect weather didnt bother with a tent. We got caught in a freak snowstorm and had to build a shelter with the contents of my PSK (2 garbage bags, cordage) and pine boughs. Our alternative was to leave the bush so it wasnt a strict survival situation.
Canada: My wife and I were part of a group of 26 high school and college students on a 10-day canoe trip through Algonquin Park. The second day out we discovered that our outfitter had shorted our food supply drastically. This was a series of errors I wont take time to detail. We had food for about 8 people on normal rations spread between the 26 of us. We held a vote and decided unanimously to continue with the trip. During the trip we supplemented our food supply with walleye, crawfish, freshwater clams, and a few very unlucky chipmunks. I lost 17 pounds. It was a fantastic experience I wouldnt want to trade for anything, but dont necessarily want to repeat.
Alaska: We had a serious scare that would have thrown us into survival mode for at least a night. We were scouting hunting locations and when we got back to the truck we couldnt get the key to turn. Most of our gear was at the cabin, 10 miles away, because when we left we were just going to make a short trip. That short trip got addictive; just a little farther, whats around that next bend, etc. The weather was about 15 degrees F, windy and snowing off and on. We finally got the truck to start and upon arrival at the cabin we packed the truck with our survival gear, sleeping bags, tent, pack full of MREs, axe, etc.
Brazil: Last week, my friend Emerson and I decided to camp out on one of the highest mountains in our area. We arrived on top with about a liter of water between us. All the known springs on top were bone dry. The sun was really low when we decided that he would use my 60 ml syringe and tube to suck water out of bromeliads and I would continue to search. I came up dry after several km and an hour of searching and he was able to produce a liter of stankyplant water. Later that night our water problems were solved in a big way but thats another story. That 60 ml syringe has gotten me out of several short water jams in the past. It is such a lightweight, low cost, and useful piece of kit that you really should include one if water is ever going to be an issue.
LOST: Thomas Linton hit the nail on the head. Ive never been lost but I often get highly confused. This past week we got locked down in thick fog and I had to resort to the compass in my PSK to get my bearings. I have gotten confused enough times to notice a pattern, I only get confused in flat ground or fog. I need to develop the discipline to navigate by compass early and often and not be lazy and overconfident.
SOAKED: The times that I have had to make a fire to dry out are numerous and could have resulted in hypothermia for myself or some other member of the group.
PLANNING ERRORS: I leave my pack packed all the time and have arrived in the bush to discover that I have run out of something or other, usually iodine tablets, battery life, filter contents, or minor meds. Never rely on memory, but verify the contents of your pack before the trip. Things degrade in time, especially when packed away in a survival kit that doesnt get opened often. Mac