Let's make one!
you can adjust the speed and frequency (might be a bit dicey). You can also play around with "player touch" and have them fall when you step on them.
I'll try and figure out one that actually moves you later.
EDIT: It think it's possible, but you might have to change the graphic. You could have them on it tapping their foot impatiently as it slowly moves. As for your actual player, have them turn transparent (to hide them, so there aren't 2 of them) then jump or walk across (careful of camera movement with jumps)then have it timed so there's a quick switcheroo with the elevator graphic and your player reappearing, as if they just stepped off.
Or figure out something yourself.
ANOTHER EDIT: I messed something up. You might need to make a second event that'll kill the player if they step onto the blank space. See, the elevator moves up, but you don't, so you're just standing on air until it comes back. So you'll need to have that Kill event move there so that it doesn't happen (and your game makes sense).