What you say there, highlights that this "Golden Age of Model Railroading" is a highly subjective and personalised concept. I think the term to most in the hobby coincides with the general concept of when the Golden Age of Railroads occurred i.e. 1930's-1950's thereabouts. By coincidence that also coincides with, in it's later years, when your modelling preferences were also at their peak and continued on from there, powered by the nostalgia of that time of the real railroads.
I have some of that, even though I never experienced it first hand and it is model railroad based nostalgia. But as far as a Golden Age of Modelling, or maybe more accurately, a Golden Age of being able to have a layout, buy trains to run on it and get the rolling stock that represent some quite obscure railroads, there has never been a time like now. By my observation at my club, the availability of highly detailed "off the shelf" models and the advent of DCC and sound, is bringing into the hobby, many who, if they had to build the models, wouldn't have given it a first thought, let alone a second. They would admire those that do and wonder at their patience and commitment, but there is just so much else today to divert them away. Gone are the days when most could sit at the dinner table and work on a model at your leisure, while listening to a radio, for most people. That there is still a core, like yourself, who continue the skills, that core could not now, support an model kit making industry that focused on that alone.