I'm British so it very much would apply for me.
I mean, it's a moot point as I don't have tickets so will not be in town for this, but I've heard reports of lengthy queues and given I remember Lisbon Airport having a long queue at arrivals even pre-EES when I went in 2023, I seem to guess it might be quite the wait, depending on flight paths.
Certainly, the worst I've had pre-EES was a 45 minute wait for a stamp at Valencia Airport in Spain, where 4 flights to non-EU destinations in quick succession were placed one after the other. So I can't say I'm enthusiastic about what's in store. Or you know. Maybe I'm just overthinking it.