I find LFD the least boring method and helps you learn your team while leveling.

If you start a new guild and level it while questing your teams to 80, yes it will take much longer but you'll have a level 25 guild you can sell for 100k+ gold.

The only method I don't have the patience for is the grind boosting. I wish I could do it, alot of people level the 80-90 fairly quickly that way, I just cant sit for that long doing it.