Uninstall Yosemite?

Question

A few days ago, I upgraded to Yosemite and it has been a disaster.  Here are just a few things I have found that make it a nightmare:
1.  It has slowed down my computer by a factor of ten!  I get the spinning pinwheel from **** all the time!  In Safari while opening pages.  In Word while opening a document.  In iPhoto while editing a photo.  And worst of all, in iMovie while editing a movie. 
2.  No more hard drive icon so I can quickly check on my storage (get info).  There simply is no icon for the hard drive anywhere!
3.  The Time Machine backup icon on the top menu bar used to spin when it was backing up.  Now it doesn't move at all so I can't tell if it's working.
4.  When downloading a file, I used to get a new window called "Downloads" it would keep track of the last 20 items I had downloaded.  When in progress, it would indicate how long the download was going to take.  This was very helpful!  Now, it's gone.
5.  The new version of iMovie is terrible!  So many buttons and controls are missing!  I cannot figure out how to do things.  I didn't know it was going to change iMovie, otherwise I wouldn't have done it.  I need iMovie for work and now I'm way behind!
6.  My Time Machine backups used to take about 10 minutes.  Now they take hours!!  What the heck?
There are a couple good things I like about Yosemite, like a top menu bar on my second screen.  It is nice to be able to control two screens with a command bar for each.  I do like the larger fonts and crisper displays of icons.  But these are not worth the changes, and lost functionality and overall speed!!
I have Time Machine and I have backed up everything.  I have my MAC OS X LEOPARD Version 10.5 in it's original box.  Can someone please tell me how to go back to it?

Answer 1

As far as the speed and spinning wheels, that may be something you need to delve into to figure out what's going on. But the general functionality issues that you're looking for are still there...
>2.  No more hard drive icon so I can quickly check on my storage (get info).  There simply is no icon for the hard drive anywhere!
Hard Drive icon should show in Finder window sidebar. If you don't see it, open Finder>Preferences, go to 'Sidebar' tab and check the box for 'Hard disks' under  'Devices'
You can also show on the Desktop by checking box for 'Hard disks' on the General tab in the same window.
>3.  The Time Machine backup icon on the top menu bar used to spin when it was backing up.  Now it doesn't move at all so I can't tell if it's working.
Icon doesn't spin, but it should tell you the last time it backed up, if you're really curious..
>4.  When downloading a file, I used to get a new window called "Downloads" it would keep track of the last 20 items I had downloaded.  When in progress, it would indicate how long the download was going to take.  This was very helpful!  Now, it's gone.
You mean this?
It should show up after you've downloaded a file.. and remain available until you clear the download list.