I don't encounter Rosen fanboys at all, at least not that I know.. since I started playing Steinitz attack vs Petroff...
I remember it was fun to refute that silly gambit, indeed... And your knight retreat is quite humble and confusing to the opponent!
But seriously for serious games... 3.d4 is just so easy to learn, and so hard for black to learn because they memorize so many gambit lines already, their brain is fried from that
Wtf