i too dont feel any different "plateau" with 2cs. i think that term is reserved for substances (like someone said before in this thread) that have a different set of effects at different levels. so basically it feels like a different experience.
there is an increase in effects with 2cb that go up with the dose, and yes, there is great variability in these, but they are still basically the same effects.
just think of mushrooms. 1-1,5g might not give visuals, but will give some energy and lift the mood, 3g is a good wholesome trip while >5-6g you will be seeing the earth from orbit, and things might get crazy and confusing. these arent plateaus, just different levels of the same drug.