We each have our own account. When it comes to a purchase, one or the other of us completes the booking. We've found it easy to pay using credit cards with either name. Of course, it was always a little bit confusing remembering who had bought the airplane tickets and who booked the hotels. Logging on to view them was never much of a chore.
It was less of a problem for us because we still keep file folders with info for most upcoming journeys. The blue one is for the upcoming one. Red is for the subsequent. Yellow for the next. I was an instructor and organizing paperwork was always a forte. I have a wifi printer that primarily functions nowadays to print out itineraries.
However, it was just this month that we discovered how easy it is to share trip information with each other. When added to a trip and shared between us, everything magically appears in chronological order. Flight segments even find their proper place.
Our next trip of this winter begins on February 12th. It has been a breeze to organize even though we will be in several countries during a two-week period.