Tbh, I was pretty surprised they did it. 5 ms is a lot. Like, I can't think of many times they've made ms changes in recent history. That effects everything. Getting to lane after backs, roaming, chasing, even matching rotations. It's a whole bunch of "you get there 1 second slower and now your adc is dead since you were late" kinda things. It doesn't do much to her in combat (infinite dashes op op -_-) but it does seriously hurt her macro game and ability to snowball around the map.
So no, I don't think it's a spit in the face. It's not my preferred nerf (I'd like to see her in-combat mobility decreased) but I am interested to see how hard it hits her, especially at high elo where every second counts.