Personally I use it quite a lot when looking for implementations. I also used code search before searchcode as well to do this, so it fits into my workflow.

However I also use DuckDuckGo, and a !code redirects to searchcode for this so there is that.

Possibly it depends on how you learn and use things. I find examples useful. For instance when looking at how to do things in Python's Fabric I would rather see some examples then read about how someone else doing it.