I think that "trying to picture their lives" is what it iss all about, ultimately.
Visiting the places they would have been, walking the streets they would have walked, standing before the altar where they were married and the font where their children were baptised.
Sometimes you get a lot out of a site visit, sometimes little or nothing. But until you actually visit the locus in quo, you'll never know.
And sometimes, having seen it, you'll be able to make sense of details or throwaway coments which otherwise would mean nothing to you.
Then there are the unexpected finds ... the plaque on the wall of the church in Great Staughton, for instance, recording the deaths of three men in the tower in a lightning strike. Wewre these men known to my ancestors? Were they their freiends, drinking companions, childhood playmates? Or were they their sworn and bitter enemies?
It all adds to our picture of their lives ...