I don't see much reaction when I'm out riding, at least at 45-55 mph type speeds. Everyone is preoccupied with driving, I'm preoccupied with making sure they don't drive into me.
Low speeds? Yeah, people notice.
I get questions from the guards about every third time I go through the gate to get on post - the guards are constantly rotating stations. A couple of them recognize me and the bike now.
"Hey, check out this guy's electric bike" -- common refrain called to another guard