Many of these sliders have special behavior which is quite useful. For instance, the "blend if" sliders have two controllers, each one of which can be broken in half by option-clicking it, the threshold slider shows a histogram above it, and many of them have keyboard control of one sort or another (which is not always reasonable to completely homogenize).
It is true that having such a diversity of styles is a bit absurd. They could do certainly do with no more than 4 or 5 styles, all mostly visually similar. Still, the actual behavior of all these sliders is pretty solid, in my experience, and I'm not really bothered too much, as a long-time user, that consolidating widget appearance isn't Adobe's top priority.
It is true that having such a diversity of styles is a bit absurd. They could do certainly do with no more than 4 or 5 styles, all mostly visually similar. Still, the actual behavior of all these sliders is pretty solid, in my experience, and I'm not really bothered too much, as a long-time user, that consolidating widget appearance isn't Adobe's top priority.