Mustang has an amazing 3-position ramp that changes state depending on the mode, feature, or shot requirement at any given time. It can either open up a full orbit, be a quick return to the left flipper, or a longer path around the back of the playfield to the "bowl" and right flipper.

The new Mandalorian premium and LE will have a scoop ramp that only activates at certain times. The same shot will go to a simple turn-around area when the ramp is up.

Black Knight: Sword of Rage has its ramp blocked or open by the position of the flail. Sometimes the flail is even spinning to either bash the ball back at you or help send the ball up the ramp depending on what is going on in the game at the time.

Wheel of Fortune has a series of inline drop targets blocking a ramp.

Maybe not exactly what you are asking for, but cool to think about the different ways ramps can change availability or path during a game.