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This phone is great. But something I'm really missing from TouchWiz is the ability to swipe down from the top of the screen and immediately reveal settings (i.e brightness, lock orientation, wifi etc.).
Are there any apps available that provide this functionality?

Just install power toggle and you're good. Don't forget to check on Notification within app.
so it is acceptable to use extra software than an extra finger?
It is for me, screen rotate, flashlight, mobile data, quick audio and wifi hotspot toggles aren't accessible using the two fingered swipe. All stuff I use daily.

@rxpert83
is that with gravitybox?
I'll have a Nexus 5 in my hand next week. It may last 24hrs before being flashed with CM11. I love their notifications panel.Stock + Xposed + gravity box or just about any custom ROM already has it as a feature