There have been so many forms of removable storage for digital cameras, although arguably the most convenient currently is the SD card - small, huge capacity, relatively inexpensive and reliable. There were cameras that took floppy disks, cameras that took rewriteable DVDs, then Compact Flash, Smartmedia, SD, xD, Memory Stick, and now new cards such as the very expoensibe XQD. That is not intended to be an exhaustive list!
And now of course, ZEISS have added to the field the idea of the built in SSD with their new ZX-1 mirrorless full frame camera, my review is now live on EPZ.
Of course, it doesn't really matter how we transfer our images to the computer as long as it's convenient and works. I tend to use card readers rather than cables, finding it suits my way of working. I view and copy over the images using Explorer, again simple and it works. So is the built in SSD the future waiting to happen? Time will tell.....