I think, either with a long-lived species or one that has stopped aging
or with generational ships or maybe some technology we haven't thought
of, travel between stars is possible, but not ever going to be a daily
occurrence.
For that reason and that we haven't been visited, I think we are
probably very close to alone. Life is probably common enough, of the
single celled sort, but there is no sign of the advanced technologies
that would have star ships. That is probably because the universe is
actually a dangerous place and a planet like the earth is
extraordinarily lucky to be able to have the billions of years of
evolution needed without an occasional sterilizing event (we have barely
missed having one several times).
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