When I hear about UFO sightings I always think of this map:
The visitors from another galaxy aren't exactly well-traveled, they seem to only speak English.
Joking aside I think the vastness of space makes such visits very unlikely and especially so many that people report. We might expect some evidence of life but signals, light, or debris spotted out to space, not dozens upon dozens of trips in spaceships.
The idea that we haven't found evidence of life elsewhere is more interesting to me. What that means about the universe and our place in it. Things like the Femi Paradox and the Great Filter.