Check out System Settings > Workspace Behavior > Screen Edges.

There you can disable any actions in the corners, or assign some other ones.

To reset resolution quickly, try for example:
Alt+F2 and in the kickoff: xrandr -s 0 (or do that in the terminal). 0 is normally the default resolution. To see them all just run xrandr in the terminal. They should be indexed as 0, 1, 2, 3, ...etc.

For my multimedia playback needs I use some combination of mpv and vlc depending on the scenario. mpv is a fork of mplayer / mplayer2 which is actively developed.

mmm...maybe DeaDBeeF

Honestly, my theoretical ideal Linux desktop would be a backdrop with nothing but a terminal widget at the bottom of the screen. I often found it easier in Ubuntu to hit ALT+F2 and just launch the program I wanted from a terminal. The ALT+F2 run dialogue seems to be missing from Cinnamon, and I really miss it.

Mind you, in practice, there are a number of programs that I use so frequently that a toolbar is indispensible. Typing "firefox" in a terminal every time gets old, so an icon shortcut is better there. Plus, proper volume, wi-fi and shutdown widgets are a must. The terminal purists get my back up sometimes, especially when they look down on pure desktop users - there are simply some things that work better from the terminal, others from a desktop environment.

I'll post my Mint gaming desktop a bit later on as I'm on my Windows work PC right now.

* was talking about Arch Linux - customization and stuff, that's impressive

deadbeef really a good audio player

It's not missing, I use it all the time.

Go to System Settings -> Keyboard -> Keyboard shortcuts -> Cinnamon and you'll find it as "Run dialogue", might have been unset. Some other DE stealing it?

A few years ago, I made a distro with only keyboard shortcuts to start programs and open folders. It was bliss.

I like some of them, like the cube for switching virtual desktops and etc. One has to use a good OpenGL driver though, and set desktop compositing to use OpenGL in KDE. Also, don't forget to disable compositing for fullscreen windows (like games). That improves performance.

I use my Linux desktop for work as well :) Windows doesn't come even close in productivity.

Thanks. The real beauty of openbox doesn't show up in a screen shot though - keyboard shortcuts. I've got a ton of shortcuts setup for everything from launching programs to moving windows to resizing windows. I rarely have to touch my mouse.

Virtual desktops are simply tools to extend the screen size. Instead of crowding one screen with many windows, you can spread them around based on some logic (for example you have a bunch of e-books opened, then you have browser and e-mail client, tons of terminals and may be your game running at the same time. When it's all on one screen, it's a bit messy.

Enter virtual desktops. You can segment your applications and spread them to different desktops to make them easier to separate.

System Settings > Workspace Behavior > Virtual Desktops

Set the amount you want, and layout as well. I usually prefer a grid 2 x 2 (number of desktops - 4, number of rows - 2).

Then put a desktop switcher widget on your panel

Unlock Widgets, Add Widgets > Pager, Lock Widgets

Then set switching virtual desktops to Ctrl + Alt + ←, Ctrl + Alt + ↑, Ctrl + Alt + →, Ctrl + Alt + ↓ (I usually prefer Meta to Alt though). That can be done in System Settings > Shortcuts and Gestures > Global Keyboard Shortcuts > Kwin > Switch One Desktop Left / Up / Right / Down.

KDE offers another abstraction for ordering your running applications - Activities. Think of them as orthogonal to virtual desktops. I.e. it's like virtual subsessions. Read more about it :) KDE is one the most versatile DEs really, but learning it can take some time.

There is a program called DeaDBeef that is very similar to Foobar2000. Mine is minimized in my screenshot, but it works the same way.