It happened three times to myself during last year..
First time was bussed across ramp from North to South Terminal.
Second time we arrived, not a word said before disembarking. Quite a few confused passengers once in Terminal.
Third time, was advised by crew and was left to passengers to find their own way over to South Terminal. Appears they do not do bussing between terminals anymore.
Am getting used to it now, but irrated a lot of other passengers.
Agree, use of one Terminal would make life easier.