Lazy susan

Might work for heavily crowded day. It's not lazy if it works

Yeah it’s inpressive and also less invasive if people are already sitting around the table

I mean the table should be set before customers sit at the table in my opinion, thats how you get around that problem. This looks neat but doesn't really serve any purpose in my opinion (not to mention I've only seen this in asian restaurants, which usually involves a bowl and... i wouldn't risk it.)
The way I usually see it used is that you order food and then you have the different plates (meat. veggies, rice etc...) on the center, so everyone can just turn the center plate to get a serving of each rather than ask people to pass dishes around.