The EU person typically looks at me for a second or two and then stamps. Maybe they ask me how long I'm staying, I say "a week" or whatever, and they stamp.
The US people (EWR or JFK, maybe it varies) have an attitude that suggests that they think someone who visited Switzerland or Denmark is likely to be coming back from a vacation training with ISIS. They also really can't decide if my girlfriend is supposed to come to the booth with me, all of the rules suggest no since we are not a family, but then they tend to get upset after they ask me if I was traveling alone and I say no.
That isn't too surprising, is it? That would be true for almost every democratic country.
As an EU citizen, I found entering China less scary than the USA. The Chinese officers were almost painfully polite and matter of fact, whereas the TSA officers were borderline rude and threatening. I'd really lover to go for holidays in the USA again, but not anytime soon. Since I don't have a FB, Twitter or IG acc't, I'd probably be denied anyways.