At home, I was used to bump the mouse to see my desktop. Now I have to drag or hit Esc. It's not that much difficult, of course, but if I do it twenty times a day, it becomes a bit annoying. The last time I tried, Bastion Nocera successfully ignored my requests to avoid lowering shield when session locking is disabled. It's trendy.
I'm pretty sure "Bastion" rejected the idea, instead of simply ignoring it :)
There's a gnome-shell extension to disable it.
Oh, that's so great! It wasn't there when I was looking for it. Here it is: https://extensions.gnome.org/extension/672/disable-screen-shield/
Thanks Bastion...er, Bastien.
On the other hand, I saw Windows 8 recently and I couldn't find a difference. They copied GNOME's behavior perfectly. It felt like home :-)
And that's how to disable it on Windows: http://www.pcworld.com/article/2013667/8-worst-windows-8-irritations-and-how...
The reason why it's there is the same as why it's in GNOME, it stops touches/keypresses/mouse clicks from getting to the apps for the time when the screen turns back on. So it's a requirement for touch devices, as well as for desktops and laptops that lack touch.
One could argue that users are pretty used to and happy with mouse wiggling. But I don't mind that much, as long as there is the extension available. Thanks again.