Airportw - true, Hi/Lo has a little room, altho I've never seen anyone close the door, LOL.

I always go into one or more stores after getting cash (even if I'm not buying anything), never directly from ATM to my destination.

Re: the cab driver waiting for you to do your Cambio business - on a chartered ride for sure, on a regular route taxi, maybe not if there are other passengers. The driver would typically ask the others if they mind waiting for you to do your thing (same way if you want to be taken up a lane/off the regular route.). Alternatively, they might take the other passengers to their destination first, and do your business last.