What did he do people? He bought companies that he knew everyday people like himself loved to use. His circle of competetence. He has written in one of the best books every written on managing money(One Up On Wall Street) on how we buy and hold companies who's products were used all the time and were popular with the consumer and hold no matter what happened to the stock in the short term. Besides Warren Buffet, Peter Lynch is the king of the multi-bagger by using this strategy.
The world has NOT changed in this regard. People don't change that much. If they use a product today, like starbucks coffee, to start off their day everyday, somebody rteally is going to have to try really hard to convince that person to do otherwise tomorrow. So far SBUX has just dominated and nobody comes close. If you had bought the stock in the 90's and held through till today, despite the downturn in2008, and the stock going down 75%, you would still have a multi-bagger on your hands and returns of more than 15-20% a year, DESPITE THE 75% downturn in 2007-2008!