How can I move everything from my MacBook Pro Retina mid 2012 to a new MacBook Pro without reinstalling everything
Several ways to do this, you have partially answered your own question... Most "hassle free" way would be using Migration Assistant on both Macs.

The procedure is described with a step by step procedure below:

http://support.apple.com/kb/HT5872

I would suggest you avoid the Wi-Fi option altogether, due to a lot lower speeds than a thunderbolt cable, but it can be used if you have no thunderbolt cable, or no external HDD that you can create a Time Machine backup on.