You'll want to install a replacement launcher on the NT because it will make it a lot easier to find and open the 3rd party apps you've installed. It's also really easy so there's no reason not to do it.
If you followed my advice last night and installed the Amazon Appstore on the NT then all you need to do is open it and search for launchers. There are a bunch of free ones to choose from.
I've heard a number of good things about "Go Launcher EX". It's the one running on the NT in the picture above. It seems rather ordinary to me but a number of bloggers swear by it.
Go ahead and try several and tell me the one you like best. But remember to also search for the launcher from the old B&N menu right after you install it; this will let you find it easier when you have to reboot your Nook Touch.
The Kindle Fire can't access the same broad selection of Launchers in the Amazon Appstore as the NT, and I suspect that Amazon altered the Kindle Fire enough that most launchers won't work.
It can only see one launcher: Claystone. It wasn't my favorite at first but it's growing on me. It's a good one to get before you go look for others.
Update: I don't know what changed but now I can see a second launcher when viewing from my KF. It's Go Launcher Ex,the ame one that is well liked on the NT. I'd get it, too.
BTW, you can switch from the original Kindle Fire Home screen to one of the new launchers pretty easily. Press the home button. You should be offered your choice of either the original or any replacement launchers you've installed.
To find more launchers we're going to have to turn to sites like Freeware Lovers. Unfortunately, the 3 I found on that site won't work on my Kindle Fire. So that leads me to SlideMe, my second choice for free apps. There are a couple free launchers there but none will run on my KF.
I'm going to have to keep digging for the KF. If you have a launcher you like, please post a link in the comments.