I wouldn't recommend getting a Wishes FP, personally.Been that way for weeks now, the only benefit was being able to lean against the wall to watch Wishes. Disappointing for my In Laws who we took over.
No doubt it will help congestion. Using my AP I've checked getting Wished FPs 30 days out and it seems very do-able at the moment
After you use your first 3 FP+, you can go back to the kiosks to get more continually throughout the day. If you book a FP for Wishes though, your last FP+ won't be until 10 normally.
Of course it's all up to your personal preference. I have seen Wishes from pretty much everywhere in the hub having worked there and the new viewing area isn't really anything great. And they really pack people in too.