I myself am only lvl 26 atm, so no dungeons for me yet. However, when I'm at a high-enough level I'll gladly join you powerlevelers (by which I really mean GW2-addicts :p).
In questions of science the authority of a thousand is not worth the humble reasoning of a single individual.
Never memorize what you can look up in books.
Never memorize what you can look up on the internet.