The function is still there where it always was: in the "Change parking/service" menu, which appears only if you call GSX after you already have a gate selected as a destination, to eventually change it, warp to it, call a follow me, remove the AI and now see the position with a pointer.
It's not available when you initially select a gate, and it never was, and it wouldn't be very useful even if it was because, when you initially select a gate and it's occupied, you'll get a question if you want to use it anyway, which will also remove the AI so, no need to have that option there, since it's included in the follow-up question.
However, we did add the "Show me this spot" there, so you can just use the menu to have a look where a gate is, without actually selecting it.