If you want to pvp at 80 then you more or less need to subscribe at the moment, but there's a new minigame mode coming in a few months that will remove the gear and AA imbalance.
PvE wise you can play many dungeons at 80, and gear up with blue gear, and Epic T1 gear through raids. If you choose to go the path and get all the blue gear then upgrade to Epic, the content can last 2-3 months atleast.