I don't think it's that different from many of the other years myself. Just last year we kept 4 TE's, 6 CB's, and found a roster spot for a guy whose primary duty was to return punts (as opposed to KO's like this year).
Of course as you said--many years we don't have to worry about more than 2 QB's, but that has varied at times. We knew that the team may carry 3 QB's way back in June when Tebow first came here.
It's just the nature of the roster game in my opinion, although you may have a different viewpoint.