Yes, it is still a thing. I had to turn off the "Require continuous press" option in Customize summon.
I want to be in the car when it happens, so here's what I do:
1. Back up toward the garage
2. Put it in park
3. Take foot off brake
4. Double tap Park stalk
5. Choose reverse direction.
6. Open door and lift butt off the seat (easier than it sounds)
7. Close door and sit back down
8. Enjoy the ride.
I may use this feature to make it easier for my wife to back into the garage when we have two Teslas.