Welcome back, Neef!
As TMcMahon said, questing is fairly linear nowadays. There are a few random, side quests, but you can usually tell that they're not part of the main chain. Combined with the locations shown on the world map and minimap in the default UI and with the help of an addon such as TomTom to point you to the nearest quest area, you should be good to go.
/edit: some pointers... Make sure you are tracking your quests in the first place and right-click the header of the tracker to sort by proximity.