take a Boston flight and you will pretty much guarantee an arrival and departure out of the temporary terminal.... I could be wrong but technically the temporary terminal is right in front of T5, so its a temporary T5 terminal.
anyway, I did not find this terminal to be too dreadful on my last flight to/from Boston. I got to the airport kind of late, security line was long, but the bus ride was short, and as soon as I got into the temp terminal they started boarding so I was the first one on the plane, heh....
hopefully with the new terminal there will be less "dreaded" things about JetBlue to deal with when you fly.
--Russ