I'm really learning to hate the garrison because I've been trying to have all my characters completely keep up with their garrisons.
So it ends up taking up to 2 hours just run everyone through all the basics
mine
herbs
work orders - pre-100 that means herbs/mines/1-2 professions/maybe barn/maybe lumber missl
missions with up to 20 followers to juggle.

So far the only short cuts I have found include

garrison hearthing from the end of the mine

AND

/target shadow
<interact with target>
/target bron
<interact with target>

this last sequence, has worked 100% of the time in the level 2 garrison to get from the missing table to outside

But after that I can't find enough fixed NPC's to use as waypoints
At least ones that don't have player catchers between them and other fixed NPCs