I agree with that sentiment. As someone else said: GWX is the ultimate ASW weapon.
I'm on my 4th patrol with my second career in January 1940 and have yet to see a convoy. Not really lamenting that fact either. I've been quite comfortable with my singletons.
I'm really fearful of convoys after having my ass promptly handed to me during a convoy attack in my first patrol in '41 in my first GWX career.