The GEL is included - you just need one more thing to enable it:
Massive Google Search 3.1.8 Update Rolling Out, Brings Google Experience Launcher To All 4.1+ Devices, New Cards, Completely Fixes GEL On Tablets, And More [APK Download]
I love the new launcher! At last it treats photos in a sensible way when you set them as wallpaper - I used to hate the way the old launcher distorted my photos.
It seems to make the leftmost homescreen the default which is a bit weird but I guess it's so Google Now is always a swipe to the right.
Welcome to Android's most annoying thing. The wallpaper needs to be wider than you would think because you pan across it as you swipe homescreens. There are threads here discussing the best pixel size for wallpaper. Also there are apps which tweak the way it works.
'Niggle' is a pretty common word in the UK - I guess it hasn't crossed the pond yet?
I don't really understand why it should take 20 seconds to turn on when I only have to hold the button down for like 3 seconds on mine. Why is there such a difference?