This is a great use of one's location data.

I've personally found Google's location history to be a net positive for me. From places I've been whose precise addresses I can't remember (e.g. distant family events), to tracking hospital, doctor visits.

I've even used it as a proxy for timesheets when I used to work from an office on weeks where I wouldn't have recorded my activities well (like which client I visited, how long I took lunch, etc).