I, for one, partially welcome Veigar's E change [Cue mass downvoting]
I actually appreciate Veigar's E change to an extent, because I can't tell you how many times I've been instantly stunned and taken from 100-0 in about a second by a Veigar without even a second to react. Yes, mobility creep, blah blah blah, but just because you need it to burst down targets that are too quick for you doesn't make it balanced for someone who ISN'T MOBILE, like Nasus, Sona, or Annie. Immobile champions just get completely destroyed by Veigar in mid game, as he proceeds to stun you without any way to stop or dodge it, and then rips you a new asshole with his (probably) insane magic damage.
That being said, I did have to wonder "What the hell was Riot thinking" when they gave it warning particles. Delay it, sure, that makes sense. Most AoE stuns in the game need to be channeled and aren't instant, so no problem there. But warning particles? Really? It makes sense for Dark Matter since that does a metric fuckton if it hits you, but seriously? Yes, some AoE CC abilities like Braum's ult and Leona's ult are telegraphed (Braum shouting and leaping into the air, Leona shouting, raising her sword, and you see a small light in the center of the blast) but the radius of the abilities aren't completely revealed before they go off.