I had mine yesterday, in a tiny portacabin next to a pharmacy many miles from home (nearest place - nowhere near us seems to be jabbing people now, I had to take DS2 almost 50 miles to the next county via multiple buses to get him jabbed recently!).
Like OP's experience, it only took 30 seconds. I was the only person there though. Asked my name, DOB and what arm I wanted it in. Went in and was jabbed a second after my buttocks touched the chair, told "You know what to expect, yes? You've had the other jabs before." And that was it.
I didn't mind that one bit though. Far preferable to having to queue 40 minutes, go through loads of the same questions twice and have to wait around afterwards. I may try to take DS1 there for his booster, as he's very needle phobic and if he has to wait at all he has too much time to have a full blown panic attack and has to leave before we get as far as the actual jab. He wants it, he's tried multiple times with me and on his own, but he says he needs to pre-consent beforehand and then they just run up to him and do it before he has a chance to refuse it 😁Understandably, nowhere is prepared to do that for him though.
I feel like crap today, mind. Had a banging headache since 3am, very sore arm, shivers and no energy. The last booster gave me no side effects at all.