The search bar, apart from finding programs and recent documents, works as a calculator (2+2=4), currency exchange value (50eur = 59.66 USD, same for GBP, CAD, JPY), etc.
If everything is minimized, i just type and it shows up, or Alt+F2 to launch it.
And those are just a few features that i don't see on other desktop operative systems.
Windows 10's "hey cortana" feature is amazing though. No typing, just natural talking. It will search the web for stuff and it's not just limited to local. You can also about calculation and exchange rates on top of the entirety of the internet at your voice. For example I was trying to find the folder for a game I was playing and I just asked cortana where the steam games file is located and got the answer.