In the year 2013 it is difficult to remember why Rails was such an explosive breath of fresh air, back when it burst onto the mainstage in 2004/2005. The essay that I think best captured the switch in popularity, from Java (and EJBs and Struts, etc) to Rails, was "The departure of the hyper-enthusiasts" by Bruce Eckel, written in December of 2005. He wrote:
"One of the basic tenets of the Python language has been that code should be simple and clear to express and to read, and Ruby has followed this idea, although not as far as Python has because of the inherited Perlisms. But for someone who has invested Herculean effort to use EJBs just to baby-sit a database, Rails must seem like the essence of simplicity. The understandable reaction for such a person is that everything they did in Java was a waste of time, and that Ruby is the one true path."