Where has the Curve Precision tool illustrator gone?

Hi there

Call me thick or stupid as I've only switched to CC from CS6,

I do a lot of contouring lines in illustrator

and in the old cs6, I could

select all the contouring lines and smooth them by

object

path

simplify

adjust curve precision to say 95percent,

this would make the slight jaggy lines all nice and smooth in one click and it was fast.

In CC this doesn't seem to work nearly as well or am I missing something, 

I can still select 

object 

path

simplify 

and the slide tool pops up,

but this doesn't smooth the lines out anywhere like the old CS6 did.

im sure there is a way around this but I'm far from a wizard on CC 

if someone could help me, I would be very greatful

regards

DS