For the cooldown bar there are three slash commands of relevance...
/nui hud cooldowns -- turns the entire cooldown bar off
/nui hud cdalert -- turns off the text message alert when a spell is ready to cast
/nui hud cdsound -- turns off the audio alert when a spell is ready
As for the aura bars... as I have posted in a couple of other threads... I will be putting out a plugin for those who prefer the old style buttons. I also bring to your attention the '/nui maxauras {n}' option which can be used to limit how many auras are shown.
EDIT: You may also want to look at the slash commands section at
http://www.nuiaddon.com/documentation.html