Pretty much the same story for me. When I first joined the Labs, I got a 5630 (the successor to the 5620), also called the 630 MTG. At the time, it was an impressive piece of equipment that was a huge improvement over a regular tty.

I found the video to be somewhat lacking in interesting technical details -- there really were a lot of neat things going on in the background to make it all happen.

Readers waxing nostalgic might enjoy Rob Pike's paper describing the 5620. It provides an in-depth look at what was going on behind the scenes.

http://doc.cat-v.org/bell_labs/blit/

Of course, I subsequently got a Sun 3/60 and never looked back. But it was fun while it lasted.