For me I actually don't mind the weight of the cabinets so much (as long as I'm not trying to dead lift them). With a dolly and a strap (and a decent sense of balance) you can move games around pretty easily -- experience helps. If you're moving a game more than a few feet the strap really helps. You don't have to worry about the game as much. Admittedly I get a kick out of watching folks not use one.. :)
But what gets me is the awkwardness of cabinets..
I think you hit why some cabs "move heavier" than others. I don't know what it is about Centipede, but I can barely get that thing rocked back on a dolly. I usually have to try 2 or 3 times to get it; makes me look like a fool. And Star Wars is so deep with the heavy flight yoke out front. And that glass bezel must weigh 25 lbs by itself. All that weight out front when you have the dolly on the back make it very awkward. When I had to move it to the basement, I took out everything but the harness and the gameboards. And it was still worse than moving my converted Robotron. Hey Chris, how is your Joust project coming? Sean