Like many other comments, I like this and find it useful. Recently I took a Lyft ride late from SFO to home and it was late and I was tired and I didnt concentrate on the route taken by the driver but I was certain we took the 101. Later when I saw the charge, I was surprised to see the ride map showing me taking a roundabout way, heading on 280 and essentially doing a 70mile ride. I complained to Lyft and they refunded the money but I still wanted to know how I got home. Checked back on this and found that it was in fact a regular 101 ride home and I had proof just in case Lyft wanted it.
As others have mentioned, it is nice to look back at the trips I took and also share with others who might be visiting places where I have been in the past.