they've actually reduced the dalek usage as the last enemies of the season recently. It went like this:
First Season: Daleks
Second Season: Daleks and Cybermen
Third Season: The Master
Fourth Season: Daleks
Specials: The Master
Fifth Season: Daleks, Cybermen, Judoon, Autons, and basically everything else
Sixth Season: The Silence
Mid-Seventh Season: Weeping Angels
End-Seventh Season: The Whispermen and the Great Intelligence
Then there were the other two episodes near the end for the 50th anniversary and the doctor's 13th regen, which included the Daleks, but that was mainly based around the time war, which the Daleks were a pivotal part in. The Daleks weren't even the major villain in the 50th, that would go towards the Zygons, and even in the time of the doctor, they were teamed up with every other enemy of the doctor.
they do use Daleks a lot, but they're iconic in the essence that they're one of the doctor's oldest and longest running enemies. Within the Moffat era, he's tried to reduce the predictability of reusing the Daleks over and over, instead just making different enemies the villains near the end of the season. It was Davies who used the predictable elements of the Daleks being the major villains, and tried to change it by using the Master, then alternating between the two. Much like the older seasons, I would like to see a larger rotation of enemies as the end villains of the seasons this time around.