You can still _sort of_ get a stamp from them. When you enter/leave the Schengen area, you get a stamp. The stamp will indicate which country you entered/left the Schengen area. (Obviously, if you have a passport from within the Schengen area, you get no stamp.)

Then again, I've also noticed that US passport control has stopped stamping my passport.

They will happily stamp your passport if you ask them

You can most certainly get one if you arrive by cruise/ship which left a non-EU port