If we could live for millions of years, while all other species retained their current lifespans, we could then observe the gradual accumulation of what you call micro-evolutionary changes. But we can't. We can, however, observe evolutionary changes with short-lived creatures, notably bacteria. There is other evidence:
Observed Instances of Speciation. That's right ... observed!
Ring Species. We can observe two species and the intermediate forms connecting them.
Ensatina eschscholtzi: Speciation in Progress. A Classic Example of Darwinian Evolution.
One gene produces major changes in stickleback fish. Stunning example of evolution.
The domestication of the russian silver fox (40 year fast track evolution).
The fossil record, however, is mostly what we have. It gives us evidence (choppy, of course) of such changes over vast periods of time. Where DNA evidence is available, the conclusions drawn from the fossil record are confirmed. With our limited lifespans, it's the best we can do. Why would you have us do less?
Just looking for the honest evolutionist who will admit it is a weakness in the theory that you can't observe the mechanism doing very much. You ain't that man I guess.