The other parks all have Rider Drop/Pick up locations. For both Uber and private cars to pick up/drop off guests (like a parent dropping off a child)
They are fairly well marked.
AK is close, right near the tram, opposite of the buses
HS is a tad bit further, down the side walk between the parking lots and sort of behind the buses
Epcot is between the bus stops
I bet Robo has done a map. I'll see if I can find one
ETA - No map shows them except HS and that one doesn't match where we've been picked up/dropped off so not certain it's up to date.