a different take on the subject -
i prefer to create alts and do the first levels over and over and over
why? well at low levels i can actually level every now and then and get new powers without spending days stuck in some level watching my xp bar creep up slowly
i like to try all the different at and powerset combinations
some day i might actually find one i think is worth taking past level 25 but right now i see no big reason to get to level 50 anyway, perhaps if CoV ever comes out and there is PvP
but really, what is the big deal about being high level right now?
get to level 50 and powerlevel your friends alt who power leveled you to 50?