It is worth it--without a doubt. You have access to a ton of stuff (flight planning, TFR info, approach plates, WX, aircraft valuation, airport directories, medical info, et al) on their website that the general public has no access to. I love their magazine--much, much better than Flying Magazine. AOPA has very active lobyists that defend GA in DC, state, and local governments
I have been a member for many years. I have also belonged to EAA, NAFI and other organizations. AOPA is the ONLY ONE I renew year after year.
Here are some of the perks:
-AOPA Pilot Magazine
-AOPA Flight Training Magazine
-Medical Info
-Airport Directory
-Approach Plates online
-FREE AD&D Insurance
-Aircraft valuation services
-Online flight planning, WX, TFR info
All for $39.00 a year. You cannot go wrong.