Honestly, as someone who has played her a fair bit(Simply because I like her kit, she could have been considered the weakest champ in the game and I'd still use her) I DO notice the speed change, mostly when trying to dodge things.
For my usual Q+W harass combo, I actually PREFER this "nerfed" form, as I never land my W before the Q lands anymore, and thereby I always proc the Q damage(Occasionally I would W too soon and beat my Q to the target pre "nerf").
But when dodging Skillshots the new speed is a pain. It used to be I could use my W to jump left out of the way of a skillshot, and unless they knew where I was landing I'd probably dodge it. Now they can basically just shoot it in the direction I'm jumping and it'll most likely hit me while I'm travelling, which is probably a good thing overall so she's not so safe.. But it IS a lot harder to dodge things with it now.