I learned this after I hit 50. Now I make sure to clear any blue quest givers before I leave a zone. Unlocks classes, dungeons, raids and flying.
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Yes, treasure hunts were unlocked via a blue quest(i think one that started at wineport). So was the casino, the sightseeing log, the challenge log, dozens of optional dungeons(starting as low as level 20), 7 sets of optional raids, 5 sets of hard optional raids, harder versions of some trials, the glamour system, using color dyes on your gear, the deep dungeons, eureka, the hildi questline, a dozen or more extra emotes, 13 and counting beast tribe factions, and honestly im sure theres more that arent immediately coming to mind.