As quick as I’ve ever been through an EU queue
Flew to Bilbao a few weeks ago via Frankfurt (no direct flights) and it was mixed, at Bilbao, and I presume most small regional airports it didn’t seem to be a massive issue. The same can’t be said for places like Frankfurt where both passport gates commiserated with me that I had to wait in a 1/2 hour queue that just didn’t exist for EU travellers.
Having said that can’t remember the last time I travelled through or to a major European airport.
There used to be any number of direct flights to Bilbao from Manchester (for example), now there are none. I think we may have to get used to stop overs at major hubs for at least the near future, maybe even for good.