The interesting thing to notice here, is that the biggest impact of all that improvement in hardware, when you look at it in a web context actually goes towards increased execution speed of javascript.
Most of the other advantages only come out when playing computer games or something like that.
I disagree. The biggest change over the last 5 years has to be that we're designing web content for mobile devices in a very serious way.
And that is due to many of the 'moore's law' advances that have relatively little to do with javascript execution. (Small-screen quality, cpu/gpu/memory speed, improved communications chips and infrastructure, etc)
Most of the other advantages only come out when playing computer games or something like that.