Originally posted by Digitalis No they don't, if you are using a lens that is fast enough you can still encounter it.
Pardon?
Of course, higher pixel density reduces the chances of moiré occurring.
I'm assuming you wanted to write "sharp enough" rather than "fast enough" because lens speed is not relevant here. But even the sharpest lens has a resolution limit and if you make the pixels small enough, the lens acts as a sufficient low pass filter to avoid moiré completely.
Avoiding moiré completely is tough, but every increase in pixel density helps. That's why the 36MP D800
E makes a lot more sense than the 16MP K-5 II
s.