It sure does move pretty fast! Most of my job is to learn this stuff, evaluate it, and teach it if I like it and I can't even keep up.
That said, it doesn't bother me at all. It just means that people are figuring out ways to build better apps and websites. We're advancing a ton right now and it's pretty exciting.
I can understand that people feel burned when things change too quickly, but that is a huge part of our industry - it will never stand still.