A marathon is something that very few people do and even marathoners don't do it often. A marathon is an extreme event and has severe negative consequences for the runner. It's been likened to "tearing up the carrots to see how they're growing." A marathoner may have a faster time by carbo loading but but none of this is really good for him/her. Ask any marathoner how they feel immediately after a race. The answer will be something like "spent, fatigued, thirsty, hungry, exhausted, please let me bend over and catch my breath and then lie down and rest (and begin the long road to recuperation)..."
I am an marathoner myself, and all of the above is bumpkiss. Even on my very first marathon, I wasn't completely spent, I walked around, spoke with volunteers, timers, other finishers, enjoyed the post-race food, had a soda. Day after, I was pretty sore, but I was still able to go about my usual daily activities with minimal detriment. If you ask a marathoner what they feel like when they cross the finish line, elation and pride will be the most common responses.
You don't carbo load to get a faster time, necessarily, though it helps. You carbo load so that you've got a good stockpile of fuel to burn during the run. It helps keep your energy up, energy gels and such aren't going cut it for the entire event. Since I've done events where I've taken no special dietary customs and one's where I've loaded, I can say the difference is substantial and well worth doing. Properly.
Contrary to your statement, your average marathon is not an extreme event. Ultras are extreme events, regular marathons on trails are extreme events. With proper training, your average street marathon is very do-able, and many runners complete multiple marathons in a year.
Long road to recovery? For someone in shape, this should be less than 2 weeks, and most marathoners will be running recovery runs within a few days. I usually take the day after the race off, and go out for a short 2-3 mile run the day after that.
I think I've got at least 3 normal marathons, plus some 25-30K trail runs, and a good have dozen half marathons on my calendar for this coming season. I'll likely post a thread with my calendar in it before I do the first event and update it with my times as I do them.
I find your post insulting in addition to its misinformation. Please try to learn more about running events before you post. Its very insulting to runners.