I know well what you're saying here. Recently I had a performance review with my line-manager, it was all going very well, and suddenly he started on about how I was an 'expert' Perl programmer.
I stopped for a minute, recalling London.pm meetings and the people I'd met there, many of who I do consider to be far better Perl programmers than I am.
I told him I didn't agree, I said I'm not there yet but I'm working towards it. He looked slightly confused, probably not used to people disagreeing with good things in reviews, and told me to compare myself with the other Perl programmers in the department. I could suddenly see his point.
Now I have the advantage of both having people who know far more to learn from, and people who know far less to teach to. It inspires a wonderful combination of hubris and humility. I'd recommend it, you run to try and catch up with the pace-setters ahead, but make sure you're trying to set pace for those behind.