I am not sure how the ears are programmed in WDW, but I can say in DL, they are MUCH less annoying than anything sold on the glow carts. They certainly do not have strobe capabilities. They are small color changing LEDs inside translucent (but not transparent) plastic. In DL (again, not been to WDW) they change color gradually, and even a quick color change is NOT the same thing as a strobe.
They are not as bright and do not change as quickly as the millions of glow necklaces and swords. Strobes can cause seizures, but a strobe light is an extremely bright light that flashes in repetition quickly. I am not sure the Glow with the Show Ears even have that capability.
I will say that if those ears are difficult, I am surprised that you can tour Disney parks at all after dark. Even my wheelchair has LEDs that makes my wheel light up, and I am constantly surrounded by people with color changing swords and necklaces. If those are enough to trigger seizures, then I would avoid Disney parks after dark.
I can understand how the glow necklaces and swords are annoying and distracting during a show like Fantasmic. But I have been in many shows where there were the GWTS Ears, and I did not even find myself distracted by them (which is a feat, given my level of ADHD).