Many, many smart people have ideas, but can never finish anything. Or for that matter, never start anything.
You hear "does stuff", and take it out of context into its broad definition, which includes your garbage man. Then of course it doesn't make sense.
People that create, rather than perform.
Zuckerberg made something brand new. The garbage man just does what he's told. There is a big difference.
Your dad may be famous amongst his peers.
I think the biggest difference is that the garbage man is doing what he is told to do whereas the famous people are doing the stuff no one told them to do. They broke out of the mold and got famous.
Here's the formula for getting famous:
1) Do stuff
2) Relentlessly promote what you did in step 1
3) Repeat step 2
A more coherent response: http://peachshake.com/2010/12/26/acquiring-fame/