MacBook – use the USB-C cable for the charger to transfer large files between different OS X laptops

Transmit is my personal favorite but Fetch also does the trick you ask.

iCloud will help you locate the IP of the remote machine and screen share if needed and is much simpler than getting a free DNS software solution to locate the IP of the other endpoint (assuming you have dynamic IP address or are behind a NAT router on either end of the transfer).

Honestly, if something fast like USB 3.0 or Thunderbolt are available to you, get yourself a small 64GB SSD and a USB 3.0 enclosure, or this (expensive, but a very good long-term investment if you have Thunderbolt. It's actually just a Thunderbolt to SATA adapter, with a fancy name. There are other options, this is just the only one I'm familiar with. ), and you should be able to make those transfers in no time. With such a small SSD, the price should be sub-$100 even for the fast ones.