You're right, they're still fairly subtle and probably not the first thing someone would notice about me, but if I turn my head slightly, you're bound to notice my ear moulds/tube.
I too wear BTE's with glasses and most people are surprised when I tell them I wear hearing aids. They cannot see them.
This is especially true of modern "Receiver In The Ear" (RITE) models where instead of a tube carrying sound, you have a very thin wire going into your ear canal.