The reason why I asked you to do those challenges is because you said this, "I think the D5200 have something similiar to that setting which I have not bother yet," in reply to when I said this,
"The D5200 is different from the higher end ones because you have to go through the menu in order to change crucial settings. Whereas, anything D7000 and higher (including the D90, which I have, and is equivalent to the D7000) has external menu buttons, which makes it a lot easier and quicker to use. Especially when you need to capture something quickly and don't have the time to go into the menu."
Here is a look at the back of the D5200:
Here is a look at the D7000. See all the buttons on the left? All you have to do is click them and then make the adjustments with the knob at top right. It saves time and allows you to capture things other DSLR cameras take longer to. You don't have to go into menu, make changes, and then get out of the menu.
I believe Nikon makes the lower end cameras for people who want to have a nice camera but who don't want to utilize all the benefits Nikon provides because they probably don't want to go above and beyond ordinary photos.
I know you have to go through the menu to set your camera to live view and I believe you did say that you shoot better with the live view on. I personally can't shoot like that but I do use live view to record and recording on my D90 is very easy. Just click the Live View button > then click OK to record > and OK to stop recording. I can switch back and forth if need be from photo to video with just a click. AND, it makes all those clicking sounds you said you liked when switching.
Here's the back view of my camera:
BTW, I like the swivel screen of the D5200 and had considered getting that camera at one point because of it. But, I would not be happy with not having the quick buttons especially since I have kids and they move fast and do activities that require a quick camera.
My point to you is, you have a nice simple camera that can do cool stuff, but if you have the money and want to focus more on your photos and creativity then you might want to switch it up.
If money is an issue, then disregard all my comments on the higher ends and be happy with your camera. Btw, my D90 is nice and I love it for what it does but there are things about it that I don't like and would love to own a nicer one someday when I can afford it. I guess, I like to do my research now so that when I can afford a much nicer one, I'll be prepared.