Being a so-called bush pilot operating single engined aircaft in Africa, I can not see that it gives one some magical extra experience, but it does theach you to be more aware of the machine and the enviorment you are flying in. Also being alone in the cockpit you have to learn and make and live by your choices, good or bad. The other advantage is going to all the wierdest and wonderfull runways and airports the world has to offer. Some of them is enought to make any pilot break out in a sweat at the mention of a name.
For any pilot I still belive pratice makes perfect and you never get to old to learn new tricks.