A little while back I did exactly what you are doing now and I reached the same conclusion. Tanks have more fun with LFG. I took one of my warriors from his low 20s all the way up to 40+ with almost instant queue times as a tank (even though he was specced fury the whole time).
I had a much harder time finding queues for my low level DPS toons. I tried hard with my mage and my hunter but it just wasn't the same.
That being said, pretty much all my toons hit a dry spell around the dreaded 45-55 level range, which has been a dud spot in the leveling process for the longest time now.
I eventually decided to give up on leveling my army of low level alts and wait it out till the world is revamped in Cataclysm. Though I might make a focused effort a little before Cataclysm drops to get some of my mid ranged chars to outland, if for nothing else but to experience "original WoW" content one last time before it joins the likes of 40 man Naxx, 15 man UBRS and 10 man Scholomance in the great void where all forgotten content goes to die.
I totally agree lvl 45-55 is much dreaded. Even for me lvl 40 now, 2 instances dread me a lot, Uldaman and Maraudon. I love these 2 complexed one but not really keen to spend my time doing them. Next dreaded one will be ZF... I am looking forwward to UBRS and LBRS tho. Maybe Dire Maul too, these are way fun! So now after doing my other toons for 80 randoms, i would round off the night with tanking SM Cathedral. Done it again yesterday afternoon, with a good grp I love tanking hordes and hordes of mobs in one pull. =D
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