I was kinda in a similar boat. My hunter was already decently geared, and i was burned out on raiding to keep going through ulduar/toc. Then got burned out on doing heroics after using that to catch my hunters gear up without raiding anymore lol. Then didn't want to gear my other lvl 80 because i was completly burned out on endgame at that point besides pvp. So i quit my raiding guilds because they were *****in at me to raid with them, since i was like there best dpser.
For me what got be back into the game was playing on the ptr using a premade warlock and druid. The classes were just so much fun in pvp for me, that it got me back into leveling alts through pvp.
I would say try to get into a roleplay guild if thats what floats your boat right now. Or maybe try rolling a new toon on a different type server/ alliance
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Lower levels will always be boring but you can always find a nice guild , or even try leveling thro bg's to break the monotony.
Or maybe if nothing is fun anymore, your just completely burned out.In that case, just take a break from wow for a couple months until you actually want to play, if ever. There's a lot of pretty cool mmo's coming out at the moment that you could catch at the early stages. If by the time i get my druid and warlock to lvl 80, i'm still burned out on endgame, that's probably what i'm gona do.