IBM has demonstrated the smallest possible working gate. We're still a little ways off from that but - the problem with exponential traversal is you rapidly reach the end of the road. That and the last few iterations of Moore's law are going to be very expensive. It's the economic aspect people are referring to when speaking of Moore's law coming to an end.

As a consumer I never kept a log, but both desktop and laptop computers used to "prove" Moore's Law continuously, in your face. I grew up going from under 1MB of RAM to 2MB, 4MB, ... up until what we have now, where things seem to have plateaued in the 2GB-8GB range for what seems like ages. Showing my age here...