If you only have 1 phone line, and you don't really get many calls.. then I can see how GV doesn't seem that interesting.
However, if you have a cell/landline/voip line and/or travel a lot.. that is when GV shines. You have 1 number to give people where they can reach you wherever you go. Talking to someone on your cell, yet are walking into your house? Just transfer it straight to your home line. Tired of getting unknown/blocked calls.. block them in GV.
There is so much to GV that makes it great you are not going to see the benefits if all you do is use it for free minutes on F&F. Personally I use it for no minutes on my phone, conditional call forwarding, and a free Voip line in my home via GV/Gizmo5/SipSorcery.