What is the purpose of monitoring Approach (instead of talking to them)? They may point you out to other traffic, but you have to do the inverse calculation in your head to figure out where the other traffic is.
In my case, same answer to both. Enhanced situational awareness while not really wanting to talk to anyone. Before someone accuses me of being afraid of ATC, when I'm not IFR, I've been a regular user of flight following since I've been a student pilot. My long solo cross country took me into an ARSA (now Class C). I'm a fan and a proponent of flight following. But the bottom line is, while I do have to aviate and navigate every time I fly, communicate is an option when VFR.If you’re going to monitor frequency and do all of that, why not just get flight following?