"Yes a lot." suggests strong agreement from the speaker, possibly about the safety or the value of a particular experience or idea.
"It is safer than embarking on a real adventure." implies that the context involves a safer alternative to a dangerous or unpredictable journey. According to the book Isla and the Happily Ever After by Stephanie Perkins, the speaker might be emphasizing the comfort or security found in a less risky option, like reading or imagining adventures rather than physically undertaking them.