Things have changed over the last few years though. When I started cyclo-commuting in 2004 there was no-one in my social group who cycled at all, let alone to work.
Now ?
About half the people I know cycle on something at least approaching a regular basis, and a good number of them commute by bike too. People who, just a few years ago, wouldn't have even considered it. It wouldn't have occurred to them that the bike could be used to get to work.
It does help that I'm in London I think, as cyclists are very visible, so it is becoming, if not the norm, certainly a well established travel mode.