Those of us who like to arrive early for meetings are used to being alone. That is not bad since, aside from our fear of being late, we often like some quiet time to collect our thoughts. "Winging it" is not in our nature.
At the same time, the pre-meeting period can be fertile ground for good ideas, most of which are unrelated to the subject of the meeting. [There is something about being told to think of A that causes many of us to think of B or Z.]
I have a theory that the more closely booked the meetings, the lower the quality of the meetings themselves. The real benefit of the meeting may not really start or end at the scheduled time. The take-offs and landings may be the most important part of the flight.