Yes, a lot of changes. To me the biggest one is the internet. That has been around for a while now, but the growth of modeling hobby on it has been more recent.
While I don't build model cars and frankly suck at it, the occasional one I take on reminds me that we all have our orbits of modeling resources that overlap but are also separate.
When gearing up to build a Fujima 917K, I found all kinds of things I never knew about, like paint sources that really have the right Gulf blue and orange.
Or if you all ever wanted to build a WW2 USN destroyer, I could steer you to databases that have all of the color information you'd ever need, by ship, by pattern and by color.
Point being, the net really is a good asset.
Bill