You can get off the runway if there are high speed exits, 90° or tighter turns are pretty much out of the question in my experience. And yes, in years gone by we could do complete role reversals on the 737 which included taxying by the FO as far as it was possible. However to be honest in pretty much every turn the captain had to help with the tiller because those turns would have been impossible to do with the other means available.
From the second link posted it appears to have been a very professional work of all parties in that incident, well done by all concerned.