If you haven't bought into the whole Midsummer hype yet, allow me to try to convince you. This year's Midsummer Fire Festival is possibly the most casual-friendly WoW event. Still you may ask, to paraphrase a guildie, "What's so great except for a useless pet?"
This holiday is not about the loot.
Sure, I got myself a Brazier of Dancing Flames, but I had the blossoms burning a hole in my pocket anyway, so why not? Midsummer is really about every other reason we play the game: progressing our characters, seeing the world, supporting our faction and, most importantly, fun.