This is all arguable (especially in the sphere of cooked benchmark numbers) but gcc is very much in use (though you are essentially right about the confusion surrounding GCC3 and the EGCS adventures). Not just within the FOSS space, where of course it is the de facto compiler, but in a wide range of applications, including embedded systems. As a lot of the online applications world moves to interpreted languages, you see a corresponding adoption of other FOSS technologies such as Perl, Python, RoR, PHP, etc.
As the gay community says: we are here, we are freer... deal with it! ;-) ;-)
--ravi