Apple MagSafe. The magnets snap into place with 0 effort. You can do it quiet or make it click. There is no worry about putting stress on the port, as it can just pop off and back on.
The only big downside would be for things that require constant power, there is too big of a chance for it to disconnect. And if you’re talking about data IO, there would need to be a ton of protections in place to avoid corruption if the connection is lost during writes.