Coincidentally, I just re-upped on a whim for the first time since launch myself, and I'm really liking it too. A lot has changed, and the option to solo makes a big difference to me.

I notice that you can find a "level quest listing" on a tab on your character sheet, which tells you which quests in your level range have a solo-option, and which don't. So far, there seems to be a lot for the solo player and the team-friendly. If this keeps up, I may just stay!