I'm a UK passport holder with a EU residence card (Poland).

Even with the EU residence card (which waives the 90/180 day rule for me), I had mixed experiences when transiting Schengen/Non-Schengen at AMS:

Leaving Schengen, I am allowed to use the e-gates with my UK passport and EU card, a quick check of both documents from the border guard, and off I go (no stamps on passport due to the EU card).
Entering Schengen, I have to queue up like everyone else and go to a manned desk.Presenting the UK passport and EU card, I am still asked a few trivial questions (are you heading back to your country of residence or going elsewhere? how long have you lived in Poland? etc), nothing detailed but in the past they would just see the passport and card, scan both and let me go with no questions asked (no stamps). It is a minor change but noticeable.